diff --git a/bin/sozo/src/commands/model.rs b/bin/sozo/src/commands/model.rs
index c14297034a..eecb5d74d3 100644
--- a/bin/sozo/src/commands/model.rs
+++ b/bin/sozo/src/commands/model.rs
@@ -22,6 +22,10 @@ pub enum ModelCommand {
         #[arg(help = "The name of the model")]
         name: String,
 
+        #[arg(short, long)]
+        #[arg(help = "The model namespace. If not set, the main package ID is used.")]
+        namespace: Option<String>,
+
         #[command(flatten)]
         world: WorldOptions,
 
@@ -34,6 +38,10 @@ pub enum ModelCommand {
         #[arg(help = "The name of the model")]
         name: String,
 
+        #[arg(short, long)]
+        #[arg(help = "The model namespace. If not set, the main package ID is used.")]
+        namespace: Option<String>,
+
         #[command(flatten)]
         world: WorldOptions,
 
@@ -65,6 +73,10 @@ hashes, called 'hash' in the following documentation.
         #[arg(help = "The name of the model")]
         name: String,
 
+        #[arg(short, long)]
+        #[arg(help = "The model namespace. If not set, the main package ID is used.")]
+        namespace: Option<String>,
+
         #[command(flatten)]
         world: WorldOptions,
 
@@ -77,6 +89,10 @@ hashes, called 'hash' in the following documentation.
         #[arg(help = "The name of the model")]
         name: String,
 
+        #[arg(short, long)]
+        #[arg(help = "The model namespace. If not set, the main package ID is used.")]
+        namespace: Option<String>,
+
         #[command(flatten)]
         world: WorldOptions,
 
@@ -93,6 +109,10 @@ hashes, called 'hash' in the following documentation.
         #[arg(help = "The name of the model")]
         name: String,
 
+        #[arg(short, long)]
+        #[arg(help = "The model namespace. If not set, the main package ID is used.")]
+        namespace: Option<String>,
+
         #[arg(value_name = "KEYS")]
         #[arg(value_delimiter = ',')]
         #[arg(help = "Comma seperated values e.g., 0x12345,0x69420,...")]
@@ -109,34 +129,50 @@ hashes, called 'hash' in the following documentation.
 impl ModelArgs {
     pub fn run(self, config: &Config) -> Result<()> {
         trace!(args = ?self);
+        let ws = scarb::ops::read_workspace(config.manifest_path(), config)?;
         let env_metadata = utils::load_metadata_from_config(config)?;
+        let get_namespace = |ns: Option<String>| -> String {
+            match ns {
+                Some(x) => x,
+                None => {
+                    let default_namespace = ws.current_package().unwrap().id.name.to_string();
+                    println!("[default namespace: {}]", default_namespace);
+                    default_namespace
+                }
+            }
+        };
 
         config.tokio_handle().block_on(async {
             match self.command {
-                ModelCommand::ClassHash { name, starknet, world } => {
+                ModelCommand::ClassHash { name, namespace, starknet, world } => {
+                    let namespace = get_namespace(namespace);
                     let world_address = world.address(env_metadata.as_ref()).unwrap();
                     let provider = starknet.provider(env_metadata.as_ref()).unwrap();
-                    model::model_class_hash(name, world_address, provider).await
+                    model::model_class_hash(namespace, name, world_address, provider).await
                 }
-                ModelCommand::ContractAddress { name, starknet, world } => {
+                ModelCommand::ContractAddress { name, namespace, starknet, world } => {
+                    let namespace = get_namespace(namespace);
                     let world_address = world.address(env_metadata.as_ref()).unwrap();
                     let provider = starknet.provider(env_metadata.as_ref()).unwrap();
-                    model::model_contract_address(name, world_address, provider).await
+                    model::model_contract_address(namespace, name, world_address, provider).await
                 }
-                ModelCommand::Layout { name, starknet, world } => {
+                ModelCommand::Layout { name, namespace, starknet, world } => {
+                    let namespace = get_namespace(namespace);
                     let world_address = world.address(env_metadata.as_ref()).unwrap();
                     let provider = starknet.provider(env_metadata.as_ref()).unwrap();
-                    model::model_layout(name, world_address, provider).await
+                    model::model_layout(namespace, name, world_address, provider).await
                 }
-                ModelCommand::Schema { name, to_json, starknet, world } => {
+                ModelCommand::Schema { name, namespace, to_json, starknet, world } => {
+                    let namespace = get_namespace(namespace);
                     let world_address = world.address(env_metadata.as_ref()).unwrap();
                     let provider = starknet.provider(env_metadata.as_ref()).unwrap();
-                    model::model_schema(name, world_address, provider, to_json).await
+                    model::model_schema(namespace, name, world_address, provider, to_json).await
                 }
-                ModelCommand::Get { name, keys, starknet, world } => {
+                ModelCommand::Get { name, namespace, keys, starknet, world } => {
+                    let namespace = get_namespace(namespace);
                     let world_address = world.address(env_metadata.as_ref()).unwrap();
                     let provider = starknet.provider(env_metadata.as_ref()).unwrap();
-                    model::model_get(name, keys, world_address, provider).await
+                    model::model_get(namespace, name, keys, world_address, provider).await
                 }
             }
         })
diff --git a/bin/sozo/src/commands/register.rs b/bin/sozo/src/commands/register.rs
index 8893cea2d4..85eb43dbc7 100644
--- a/bin/sozo/src/commands/register.rs
+++ b/bin/sozo/src/commands/register.rs
@@ -29,6 +29,11 @@ pub enum RegisterCommand {
         #[arg(help = "The class hash of the models to register.")]
         models: Vec<FieldElement>,
 
+        #[arg(short, long)]
+        #[arg(help = "The namespace to use to register these models. If not set, the main \
+                      package ID is used.")]
+        namespace: Option<String>,
+
         #[command(flatten)]
         world: WorldOptions,
 
@@ -47,14 +52,20 @@ impl RegisterArgs {
     pub fn run(self, config: &Config) -> Result<()> {
         trace!(args = ?self);
         let env_metadata = utils::load_metadata_from_config(config)?;
+        let ws = scarb::ops::read_workspace(config.manifest_path(), config)?;
 
-        let (starknet, world, account, transaction, models) = match self.command {
-            RegisterCommand::Model { starknet, world, account, transaction, models } => {
+        let (namespace, starknet, world, account, transaction, models) = match self.command {
+            RegisterCommand::Model { namespace, starknet, world, account, transaction, models } => {
                 trace!(?models, "Registering models.");
-                (starknet, world, account, transaction, models)
+                (namespace, starknet, world, account, transaction, models)
             }
         };
 
+        let namespace = match namespace {
+            Some(x) => x,
+            None => ws.current_package().unwrap().id.name.to_string(),
+        };
+
         let world_address = world.world_address.unwrap_or_default();
         trace!(?world_address, "Using world address.");
 
@@ -66,6 +77,7 @@ impl RegisterArgs {
             world_reader.set_block(BlockId::Tag(BlockTag::Pending));
 
             register::model_register(
+                namespace,
                 models,
                 &world,
                 transaction.into(),
diff --git a/crates/dojo-world/src/contracts/model.rs b/crates/dojo-world/src/contracts/model.rs
index 13bb96ea14..80abac351f 100644
--- a/crates/dojo-world/src/contracts/model.rs
+++ b/crates/dojo-world/src/contracts/model.rs
@@ -6,6 +6,7 @@ use cainome::cairo_serde::{CairoSerde as _, ContractAddress, Error as CainomeErr
 use dojo_types::packing::{PackingError, ParseError};
 use dojo_types::primitive::{Primitive, PrimitiveError};
 use dojo_types::schema::{Enum, EnumOption, Member, Struct, Ty};
+use starknet::core::crypto::compute_hash_on_elements;
 use starknet::core::types::FieldElement;
 use starknet::core::utils::{
     cairo_short_string_to_felt, get_selector_from_name, parse_cairo_short_string,
@@ -82,13 +83,17 @@ where
     P: Provider + Sync + Send,
 {
     pub async fn new(
+        namespace: &str,
         name: &str,
         world: &'a WorldContractReader<P>,
     ) -> Result<ModelRPCReader<'a, P>, ModelError> {
-        let name = get_selector_from_name(name)?;
+        let model_selector = get_selector_from_name(name)?;
+        let namespace_selector = get_selector_from_name(namespace)?;
+
+        let model_selector = compute_hash_on_elements(&[namespace_selector, model_selector]);
 
         let (class_hash, contract_address) =
-            world.model(&name).block_id(world.block_id).call().await?;
+            world.model(&model_selector).block_id(world.block_id).call().await?;
 
         // World Cairo contract won't raise an error in case of unknown/unregistered
         // model so raise an error here in case of zero address.
@@ -102,7 +107,7 @@ where
             world_reader: world,
             class_hash: class_hash.into(),
             contract_address: contract_address.into(),
-            name,
+            name: model_selector,
             model_reader,
         })
     }
diff --git a/crates/dojo-world/src/contracts/model_test.rs b/crates/dojo-world/src/contracts/model_test.rs
index 178e9b6495..37d5b480c5 100644
--- a/crates/dojo-world/src/contracts/model_test.rs
+++ b/crates/dojo-world/src/contracts/model_test.rs
@@ -27,7 +27,7 @@ async fn test_model() {
     let world_address = deploy_world(&runner, &manifest_dir.into(), &target_dir).await;
 
     let world = WorldContractReader::new(world_address, provider);
-    let position = world.model_reader("Position").await.unwrap();
+    let position = world.model_reader("Dojo", "Position").await.unwrap();
     let schema = position.schema().await.unwrap();
 
     assert_eq!(
@@ -68,7 +68,7 @@ async fn test_model() {
         felt!("0x027942375b09862291ece780c573e8c625df4ba41fd7524e0658ca75fff014ff")
     );
 
-    let moves = world.model_reader("Moves").await.unwrap();
+    let moves = world.model_reader("Dojo", "Moves").await.unwrap();
     let schema = moves.schema().await.unwrap();
 
     assert_eq!(
diff --git a/crates/dojo-world/src/contracts/world.rs b/crates/dojo-world/src/contracts/world.rs
index 8a639c421c..69e5888758 100644
--- a/crates/dojo-world/src/contracts/world.rs
+++ b/crates/dojo-world/src/contracts/world.rs
@@ -22,7 +22,11 @@ impl<P> WorldContractReader<P>
 where
     P: Provider + Sync + Send,
 {
-    pub async fn model_reader(&self, name: &str) -> Result<ModelRPCReader<'_, P>, ModelError> {
-        ModelRPCReader::new(name, self).await
+    pub async fn model_reader(
+        &self,
+        namespace: &str,
+        name: &str,
+    ) -> Result<ModelRPCReader<'_, P>, ModelError> {
+        ModelRPCReader::new(namespace, name, self).await
     }
 }
diff --git a/crates/sozo/ops/src/auth.rs b/crates/sozo/ops/src/auth.rs
index 35c805376f..ae6ba74e9b 100644
--- a/crates/sozo/ops/src/auth.rs
+++ b/crates/sozo/ops/src/auth.rs
@@ -109,7 +109,7 @@ where
         let model_name = parse_cairo_short_string(&mc.model)?;
         let model_selector = get_selector_from_name(&model_name)?;
 
-        match world_reader.model_reader(&model_name).await {
+        match world_reader.model_reader("TODO", &model_name).await {
             Ok(_) => {
                 let contract = utils::get_contract_address(world, mc.contract).await?;
                 calls.push(world.grant_writer_getcall(&model_selector, &contract.into()));
@@ -215,7 +215,7 @@ where
         let model_name = parse_cairo_short_string(&mc.model)?;
         let model_selector = get_selector_from_name(&model_name)?;
 
-        match world_reader.model_reader(&model_name).await {
+        match world_reader.model_reader("TODO", &model_name).await {
             Ok(_) => {
                 let contract = utils::get_contract_address(world, mc.contract).await?;
                 calls.push(world.revoke_writer_getcall(&model_selector, &contract.into()));
diff --git a/crates/sozo/ops/src/model.rs b/crates/sozo/ops/src/model.rs
index fd11cec2dd..4f44a057d7 100644
--- a/crates/sozo/ops/src/model.rs
+++ b/crates/sozo/ops/src/model.rs
@@ -11,6 +11,7 @@ use starknet::providers::JsonRpcClient;
 const INDENT: &str = "    ";
 
 pub async fn model_class_hash(
+    namespace: String,
     name: String,
     world_address: FieldElement,
     provider: JsonRpcClient<HttpTransport>,
@@ -18,7 +19,7 @@ pub async fn model_class_hash(
     let mut world_reader = WorldContractReader::new(world_address, &provider);
     world_reader.set_block(BlockId::Tag(BlockTag::Pending));
 
-    let model = world_reader.model_reader(&name).await?;
+    let model = world_reader.model_reader(&namespace, &name).await?;
 
     println!("{:#x}", model.class_hash());
 
@@ -26,6 +27,7 @@ pub async fn model_class_hash(
 }
 
 pub async fn model_contract_address(
+    namespace: String,
     name: String,
     world_address: FieldElement,
     provider: JsonRpcClient<HttpTransport>,
@@ -33,7 +35,7 @@ pub async fn model_contract_address(
     let mut world_reader = WorldContractReader::new(world_address, &provider);
     world_reader.set_block(BlockId::Tag(BlockTag::Pending));
 
-    let model = world_reader.model_reader(&name).await?;
+    let model = world_reader.model_reader(&namespace, &name).await?;
 
     println!("{:#x}", model.contract_address());
 
@@ -41,6 +43,7 @@ pub async fn model_contract_address(
 }
 
 pub async fn model_layout(
+    namespace: String,
     name: String,
     world_address: FieldElement,
     provider: JsonRpcClient<HttpTransport>,
@@ -48,7 +51,7 @@ pub async fn model_layout(
     let mut world_reader = WorldContractReader::new(world_address, &provider);
     world_reader.set_block(BlockId::Tag(BlockTag::Pending));
 
-    let model = world_reader.model_reader(&name).await?;
+    let model = world_reader.model_reader(&namespace, &name).await?;
     let layout = match model.layout().await {
         Ok(x) => x,
         Err(_) => anyhow::bail!(
@@ -64,6 +67,7 @@ pub async fn model_layout(
 }
 
 pub async fn model_schema(
+    namespace: String,
     name: String,
     world_address: FieldElement,
     provider: JsonRpcClient<HttpTransport>,
@@ -72,7 +76,7 @@ pub async fn model_schema(
     let mut world_reader = WorldContractReader::new(world_address, &provider);
     world_reader.set_block(BlockId::Tag(BlockTag::Pending));
 
-    let model = world_reader.model_reader(&name).await?;
+    let model = world_reader.model_reader(&namespace, &name).await?;
     let schema = model.schema().await?;
 
     if to_json {
@@ -85,6 +89,7 @@ pub async fn model_schema(
 }
 
 pub async fn model_get(
+    namespace: String,
     name: String,
     keys: Vec<FieldElement>,
     world_address: FieldElement,
@@ -93,7 +98,7 @@ pub async fn model_get(
     let mut world_reader = WorldContractReader::new(world_address, &provider);
     world_reader.set_block(BlockId::Tag(BlockTag::Pending));
 
-    let model = world_reader.model_reader(&name).await?;
+    let model = world_reader.model_reader(&namespace, &name).await?;
     let schema = model.schema().await?;
     let values = model.entity_storage(&keys).await?;
 
diff --git a/crates/sozo/ops/src/register.rs b/crates/sozo/ops/src/register.rs
index c1edf97264..8e8f787b95 100644
--- a/crates/sozo/ops/src/register.rs
+++ b/crates/sozo/ops/src/register.rs
@@ -14,6 +14,7 @@ use starknet_crypto::FieldElement;
 use crate::utils::handle_transaction_result;
 
 pub async fn model_register<A, P>(
+    namespace: String,
     models: Vec<FieldElement>,
     world: &WorldContract<A>,
     txn_config: TxnConfig,
@@ -37,7 +38,7 @@ where
     let registered_models_names = manifest.models.iter().map(|m| m.name.as_str());
     let mut model_class_hashes = HashMap::new();
     for model_name in registered_models_names {
-        let read_model = world_reader.model_reader(model_name).await?;
+        let read_model = world_reader.model_reader(&namespace, model_name).await?;
         let class_hash = read_model.class_hash();
         model_class_hashes.insert(class_hash, model_name);
     }