diff --git a/src/lints/type_marked_deprecated.ron b/src/lints/type_marked_deprecated.ron
new file mode 100644
index 00000000..d66234ac
--- /dev/null
+++ b/src/lints/type_marked_deprecated.ron
@@ -0,0 +1,62 @@
+SemverQuery(
+    id: "type_marked_deprecated",
+    human_readable_name: "#[deprecated] added on type",
+    description: "A type has been newly marked with #[deprecated].",
+    required_update: Minor,
+    reference_link: Some("https://doc.rust-lang.org/reference/attributes/diagnostics.html#the-deprecated-attribute"),
+    query: r#"
+    {
+        CrateDiff {
+            current {
+                item {
+                    ... on ImplOwner {
+                        visibility_limit @filter(op: "=", value: ["$public"])
+                        name @output
+                        owner_type: __typename @tag @output
+
+                        importable_path {
+                            path @tag @output
+                        }
+
+                        attribute {
+                            new_attr: raw_attribute @output
+                            content {
+                                base @filter(op: "=", value: ["$deprecated"])
+                            }
+                        }
+
+                        span_: span @optional {
+                            filename @output
+                            begin_line @output
+                        }
+                    }
+                }
+            }
+            baseline {
+                item {
+                    ... on ImplOwner {
+                        visibility_limit @filter(op: "=", value: ["$public"]) @output
+                        __typename @filter(op: "=", value: ["%owner_type"])
+
+                        importable_path {
+                            path @filter(op: "=", value: ["%path"])
+                        }
+
+                        attribute @fold @transform(op: "count") @filter(op: "=", value: ["$zero"]) {
+                            content {
+                                base @filter(op: "=", value: ["$deprecated"])
+                            }
+                        }
+                    }
+                }
+            }
+        }
+    }"#,
+    arguments: {
+        "public": "public",
+        "deprecated": "deprecated",
+        "zero": 0,
+    },
+    error_message: "A type is now #[deprecated]. Downstream crates will get a compiler warning when using this type.",
+    per_result_error_template: Some("{{owner_type}} {{name}} in {{span_filename}}:{{span_begin_line}}"),
+)
diff --git a/src/query.rs b/src/query.rs
index f7aa5b70..d02e9a61 100644
--- a/src/query.rs
+++ b/src/query.rs
@@ -474,6 +474,7 @@ add_lints!(
     trait_unsafe_added,
     trait_unsafe_removed,
     tuple_struct_to_plain_struct,
+    type_marked_deprecated,
     unit_struct_changed_kind,
     variant_marked_non_exhaustive,
 );
diff --git a/test_crates/type_marked_deprecated/new/Cargo.toml b/test_crates/type_marked_deprecated/new/Cargo.toml
new file mode 100644
index 00000000..bdcf17f0
--- /dev/null
+++ b/test_crates/type_marked_deprecated/new/Cargo.toml
@@ -0,0 +1,7 @@
+[package]
+publish = false
+name = "type_marked_deprecated"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
diff --git a/test_crates/type_marked_deprecated/new/src/enums.rs b/test_crates/type_marked_deprecated/new/src/enums.rs
new file mode 100644
index 00000000..2261b89c
--- /dev/null
+++ b/test_crates/type_marked_deprecated/new/src/enums.rs
@@ -0,0 +1,57 @@
+// These enums did not have the #[deprecated] attribute in the old version.
+// Addition of the attribute should be reported.
+
+#[deprecated]
+pub enum EnumToDeprecatedEnum {
+    First,
+}
+
+#[deprecated = "This attribute was added"]
+pub enum EnumToDeprecatedMessageEnum {
+    First,
+}
+
+// These structs had the #[deprecated] attribute in the old version.
+// They also included the user-defined warning message. Changes of
+// the attribute, including deletion, should NOT be reported by this rule.
+
+pub enum DeprecatedEnumToEnum {
+    First,
+}
+
+#[deprecated = "This message was added"]
+pub enum DeprecatedEnumToDeprecatedMessageEnum {
+    First,
+}
+
+pub enum DeprecatedMessageEnumToEnum {
+    First,
+}
+
+#[deprecated]
+pub enum DeprecatedMessageEnumToDeprecatedEnum {
+    First,
+}
+
+#[deprecated = "This message was changed"]
+pub enum DeprecatedMessageEnumToDeprecatedMessageEnum {
+    First,
+}
+
+// This enum is private and should NOT be reported.
+
+#[deprecated]
+enum DeprecatedPrivateEnum {
+    First,
+}
+
+// This enum was added in the new version of the crate with its attribute.
+// It should NOT be reported by this rule to avoid duplicate lints.
+// It should be reported as a new pub type that is part of the crate's API.
+// This might seem like a nonsensical test but is a valid edge case.
+
+#[deprecated]
+pub enum DeprecatedNewEnum {
+    First,
+}
+
diff --git a/test_crates/type_marked_deprecated/new/src/lib.rs b/test_crates/type_marked_deprecated/new/src/lib.rs
new file mode 100644
index 00000000..8a40ae7e
--- /dev/null
+++ b/test_crates/type_marked_deprecated/new/src/lib.rs
@@ -0,0 +1,3 @@
+pub mod enums;
+pub mod structs;
+pub mod unions;
diff --git a/test_crates/type_marked_deprecated/new/src/structs.rs b/test_crates/type_marked_deprecated/new/src/structs.rs
new file mode 100644
index 00000000..1c3f4231
--- /dev/null
+++ b/test_crates/type_marked_deprecated/new/src/structs.rs
@@ -0,0 +1,59 @@
+// These structs did not have the #[deprecated] attribute in the old version.
+// Addition of the attribute should be reported by this rule.
+
+#[deprecated]
+pub struct StructToDeprecatedStruct {
+    bar: u64,
+}
+
+#[deprecated = "This attribute was added"]
+pub struct StructToDeprecatedMessageStruct {
+    bar: u64,
+}
+
+// These structs had the #[deprecated] attribute in the old version. Changes of
+// the attribute, including deletion, should NOT be reported by this rule.
+
+pub struct DeprecatedStructToStruct {
+    bar: u64,
+}
+
+#[deprecated = "This message was added"]
+pub struct DeprecatedStructToDeprecatedMessageStruct {
+    bar: u64,
+}
+
+// These structs had the #[deprecated] attribute in the old version.
+// They also included the user-defined warning message. Changes of
+// the attribute, including deletion, should NOT be reported by this rule.
+
+pub struct DeprecatedMessageStructToStruct {
+    bar: u64,
+}
+
+#[deprecated]
+pub struct DeprecatedMessageStructToDeprecatedStruct {
+    bar: u64,
+}
+
+#[deprecated = "This message was changed"]
+pub struct DeprecatedMessageStructToDeprecatedMessageStruct {
+    bar: u64,
+}
+
+// This struct is private and should NOT be reported by this rule.
+
+#[deprecated]
+struct DeprecatedPrivateStruct {
+    bar: u64,
+}
+
+// This struct was added in the new version of the crate with its attribute.
+// It should NOT be reported by this rule to avoid duplicate lints.
+// It should be reported as a new pub type that is part of the crate's API.
+// This might seem like a nonsensical test but is a valid edge case.
+
+#[deprecated]
+pub struct DeprecatedNewStruct {
+    bar: u64,
+}
diff --git a/test_crates/type_marked_deprecated/new/src/unions.rs b/test_crates/type_marked_deprecated/new/src/unions.rs
new file mode 100644
index 00000000..7adc62e8
--- /dev/null
+++ b/test_crates/type_marked_deprecated/new/src/unions.rs
@@ -0,0 +1,56 @@
+// These unions did not have the #[deprecated] attribute in the old version.
+// Addition of the attribute should be reported.
+
+#[deprecated]
+pub union UnionToDeprecatedUnion {
+    bar: u64,
+}
+
+#[deprecated = "This attribute was added"]
+pub union UnionToDeprecatedMessageUnion {
+    bar: u64,
+}
+
+// These structs had the #[deprecated] attribute in the old version.
+// They also included the user-defined warning message. Changes of
+// the attribute, including deletion, should NOT be reported by this rule.
+
+pub union DeprecatedUnionToUnion {
+    bar: u64,
+}
+
+#[deprecated = "This message was added"]
+pub union DeprecatedUnionToDeprecatedMessageUnion {
+    bar: u64,
+}
+
+pub union DeprecatedMessageUnionToUnion {
+    bar: u64,
+}
+
+#[deprecated]
+pub union DeprecatedMessageUnionToDeprecatedUnion {
+    bar: u64,
+}
+
+#[deprecated = "This message was changed"]
+pub union DeprecatedMessageUnionToDeprecatedMessageUnion {
+    bar: u64,
+}
+
+// This union is private and should NOT be reported.
+
+#[deprecated]
+union DeprecatedPrivateUnion {
+    bar: u64,
+}
+
+// This union was added in the new version of the crate with its attribute.
+// It should NOT be reported by this rule to avoid duplicate lints.
+// It should be reported as a new pub type that is part of the crate's API.
+// This might seem like a nonsensical test but is a valid edge case.
+
+#[deprecated]
+pub union DeprecatedNewUnion {
+    bar: u64,
+}
diff --git a/test_crates/type_marked_deprecated/old/Cargo.toml b/test_crates/type_marked_deprecated/old/Cargo.toml
new file mode 100644
index 00000000..bdcf17f0
--- /dev/null
+++ b/test_crates/type_marked_deprecated/old/Cargo.toml
@@ -0,0 +1,7 @@
+[package]
+publish = false
+name = "type_marked_deprecated"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
diff --git a/test_crates/type_marked_deprecated/old/src/enums.rs b/test_crates/type_marked_deprecated/old/src/enums.rs
new file mode 100644
index 00000000..cc9297cd
--- /dev/null
+++ b/test_crates/type_marked_deprecated/old/src/enums.rs
@@ -0,0 +1,43 @@
+// Adding #[deprecated] to these enums should be reported.
+
+pub enum EnumToDeprecatedEnum {
+    First,
+}
+
+pub enum EnumToDeprecatedMessageEnum {
+    First,
+}
+
+// These enums already have the attribute and changes to the attribute should not be reported.
+
+#[deprecated]
+pub enum DeprecatedEnumToEnum {
+    First,
+}
+
+#[deprecated]
+pub enum DeprecatedEnumToDeprecatedMessageEnum {
+    First,
+}
+
+#[deprecated = "This attribute will be deleted"]
+pub enum DeprecatedMessageEnumToEnum {
+    First,
+}
+
+#[deprecated = "This message will be deleted"]
+pub enum DeprecatedMessageEnumToDeprecatedEnum {
+    First,
+}
+
+#[deprecated = "This message will change"]
+pub enum DeprecatedMessageEnumToDeprecatedMessageEnum {
+    First,
+}
+
+// This enum is private and should NOT be reported.
+
+enum DeprecatedPrivateEnum {
+    First,
+}
+
diff --git a/test_crates/type_marked_deprecated/old/src/lib.rs b/test_crates/type_marked_deprecated/old/src/lib.rs
new file mode 100644
index 00000000..8a40ae7e
--- /dev/null
+++ b/test_crates/type_marked_deprecated/old/src/lib.rs
@@ -0,0 +1,3 @@
+pub mod enums;
+pub mod structs;
+pub mod unions;
diff --git a/test_crates/type_marked_deprecated/old/src/structs.rs b/test_crates/type_marked_deprecated/old/src/structs.rs
new file mode 100644
index 00000000..4a8a5cd9
--- /dev/null
+++ b/test_crates/type_marked_deprecated/old/src/structs.rs
@@ -0,0 +1,43 @@
+// Adding #[deprecated] to these structs should be reported.
+
+pub struct StructToDeprecatedStruct {
+    bar: u64,
+}
+
+pub struct StructToDeprecatedMessageStruct {
+    bar: u64,
+}
+
+// These structs already have the attribute and changes to the attribute should not be reported.
+
+#[deprecated]
+pub struct DeprecatedStructToStruct {
+    bar: u64,
+}
+
+#[deprecated]
+pub struct DeprecatedStructToDeprecatedMessageStruct {
+    bar: u64,
+}
+
+#[deprecated = "This attribute will be deleted"]
+pub struct DeprecatedMessageStructToStruct {
+    bar: u64,
+}
+
+#[deprecated = "This message will be deleted"]
+pub struct DeprecatedMessageStructToDeprecatedStruct {
+    bar: u64,
+}
+
+#[deprecated = "This message will change"]
+pub struct DeprecatedMessageStructToDeprecatedMessageStruct {
+    bar: u64,
+}
+
+// This struct is private and should NOT be reported.
+
+struct DeprecatedPrivateStruct {
+    bar: u64,
+}
+
diff --git a/test_crates/type_marked_deprecated/old/src/unions.rs b/test_crates/type_marked_deprecated/old/src/unions.rs
new file mode 100644
index 00000000..74fc5432
--- /dev/null
+++ b/test_crates/type_marked_deprecated/old/src/unions.rs
@@ -0,0 +1,42 @@
+// Adding #[deprecated] to these unions should be reported.
+
+pub union UnionToDeprecatedUnion {
+    bar: u64,
+}
+
+pub union UnionToDeprecatedMessageUnion {
+    bar: u64,
+}
+
+// These unions already have the attribute and changes to the attribute should not be reported.
+
+#[deprecated]
+pub union DeprecatedUnionToUnion {
+    bar: u64,
+}
+
+#[deprecated]
+pub union DeprecatedUnionToDeprecatedMessageUnion {
+    bar: u64,
+}
+
+#[deprecated = "This attribute will be deleted"]
+pub union DeprecatedMessageUnionToUnion {
+    bar: u64,
+}
+
+#[deprecated = "This message will be deleted"]
+pub union DeprecatedMessageUnionToDeprecatedUnion {
+    bar: u64,
+}
+
+#[deprecated = "This message will change"]
+pub union DeprecatedMessageUnionToDeprecatedMessageUnion {
+    bar: u64,
+}
+
+// This union is private and should NOT be reported.
+
+union DeprecatedPrivateUnion {
+    bar: u64,
+}
diff --git a/test_outputs/type_marked_deprecated.output.ron b/test_outputs/type_marked_deprecated.output.ron
new file mode 100644
index 00000000..db574343
--- /dev/null
+++ b/test_outputs/type_marked_deprecated.output.ron
@@ -0,0 +1,56 @@
+{
+    "./test_crates/type_marked_deprecated/": [
+        {
+            "name": String("EnumToDeprecatedEnum"),
+            "new_attr": String("#[deprecated]"),
+            "owner_type": String("Enum"),
+            "path": List([
+                String("type_marked_deprecated"),
+                String("enums"),
+                String("EnumToDeprecatedEnum"),
+            ]),
+            "span_begin_line": Uint64(5),
+            "span_filename": String("src/enums.rs"),
+            "visibility_limit": String("public"),
+        },
+        {
+            "name": String("EnumToDeprecatedMessageEnum"),
+            "new_attr": String("#[deprecated = \"This attribute was added\"]"),
+            "owner_type": String("Enum"),
+            "path": List([
+                String("type_marked_deprecated"),
+                String("enums"),
+                String("EnumToDeprecatedMessageEnum"),
+            ]),
+            "span_begin_line": Uint64(10),
+            "span_filename": String("src/enums.rs"),
+            "visibility_limit": String("public"),
+        },
+        {
+            "name": String("StructToDeprecatedStruct"),
+            "new_attr": String("#[deprecated]"),
+            "owner_type": String("Struct"),
+            "path": List([
+                String("type_marked_deprecated"),
+                String("structs"),
+                String("StructToDeprecatedStruct"),
+            ]),
+            "span_begin_line": Uint64(5),
+            "span_filename": String("src/structs.rs"),
+            "visibility_limit": String("public"),
+        },
+        {
+            "name": String("StructToDeprecatedMessageStruct"),
+            "new_attr": String("#[deprecated = \"This attribute was added\"]"),
+            "owner_type": String("Struct"),
+            "path": List([
+                String("type_marked_deprecated"),
+                String("structs"),
+                String("StructToDeprecatedMessageStruct"),
+            ]),
+            "span_begin_line": Uint64(10),
+            "span_filename": String("src/structs.rs"),
+            "visibility_limit": String("public"),
+        },
+    ]
+}