diff --git a/CHANGELOG.md b/CHANGELOG.md
index caba2d81..12e7418e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,7 @@ Notable changes to this project are documented in this file. The format is based
 Breaking changes:
 
 New features:
+- Add `MonadST` instances for all monad transformers (#147 by @rhendric)
 - Add `ComonadAsk`, `ComonadEnv`, and `ComonadTraced` instances for `StoreT`, `EnvT`, and `TracedT` (#145 by @skeate)
 
 Bugfixes:
diff --git a/bower.json b/bower.json
index ae65e0cd..89b87e20 100644
--- a/bower.json
+++ b/bower.json
@@ -34,6 +34,7 @@
     "purescript-maybe": "^6.0.0",
     "purescript-newtype": "^5.0.0",
     "purescript-prelude": "^6.0.0",
+    "purescript-st": "^6.2.0",
     "purescript-tailrec": "^6.0.0",
     "purescript-tuples": "^7.0.0",
     "purescript-unfoldable": "^6.0.0"
diff --git a/src/Control/Monad/Cont/Trans.purs b/src/Control/Monad/Cont/Trans.purs
index dfb0f405..7cc92066 100644
--- a/src/Control/Monad/Cont/Trans.purs
+++ b/src/Control/Monad/Cont/Trans.purs
@@ -11,6 +11,7 @@ import Prelude
 import Control.Apply (lift2)
 import Control.Monad.Cont.Class (class MonadCont, callCC)
 import Control.Monad.Reader.Class (class MonadAsk, class MonadReader, ask, local)
+import Control.Monad.ST.Class (class MonadST, liftST)
 import Control.Monad.State.Class (class MonadState, state)
 import Control.Monad.Trans.Class (class MonadTrans, lift)
 import Data.Newtype (class Newtype)
@@ -75,3 +76,6 @@ instance semigroupContT :: (Apply m, Semigroup a) => Semigroup (ContT r m a) whe
 
 instance monoidContT :: (Applicative m, Monoid a) => Monoid (ContT r m a) where
   mempty = pure mempty
+
+instance MonadST s m => MonadST s (ContT r m) where
+  liftST = lift <<< liftST
diff --git a/src/Control/Monad/Except/Trans.purs b/src/Control/Monad/Except/Trans.purs
index 3e25a8af..1901d677 100644
--- a/src/Control/Monad/Except/Trans.purs
+++ b/src/Control/Monad/Except/Trans.purs
@@ -15,6 +15,7 @@ import Control.Monad.Cont.Class (class MonadCont, callCC)
 import Control.Monad.Error.Class (class MonadThrow, class MonadError, throwError, catchError)
 import Control.Monad.Reader.Class (class MonadAsk, class MonadReader, ask, local)
 import Control.Monad.Rec.Class (class MonadRec, tailRecM, Step(..))
+import Control.Monad.ST.Class (class MonadST, liftST)
 import Control.Monad.State.Class (class MonadState, state)
 import Control.Monad.Trans.Class (class MonadTrans, lift)
 import Control.Monad.Writer.Class (class MonadWriter, class MonadTell, pass, listen, tell)
@@ -141,3 +142,5 @@ instance semigroupExceptT :: (Monad m, Semigroup a) => Semigroup (ExceptT e m a)
 instance monoidExceptT :: (Monad m, Monoid a) => Monoid (ExceptT e m a) where
   mempty = pure mempty
 
+instance MonadST s m => MonadST s (ExceptT e m) where
+  liftST = lift <<< liftST
diff --git a/src/Control/Monad/Identity/Trans.purs b/src/Control/Monad/Identity/Trans.purs
index e7ba6f07..aa596c69 100644
--- a/src/Control/Monad/Identity/Trans.purs
+++ b/src/Control/Monad/Identity/Trans.purs
@@ -9,6 +9,7 @@ import Control.Monad.Cont.Class (class MonadCont)
 import Control.Monad.Error.Class (class MonadError, class MonadThrow)
 import Control.Monad.Reader.Class (class MonadAsk, class MonadReader)
 import Control.Monad.Rec.Class (class MonadRec)
+import Control.Monad.ST.Class (class MonadST)
 import Control.Monad.State.Class (class MonadState)
 import Control.Monad.Trans.Class (class MonadTrans)
 import Control.Monad.Writer.Class (class MonadTell, class MonadWriter)
@@ -69,6 +70,8 @@ derive newtype instance monadWriterIdentityT :: MonadWriter w m => MonadWriter w
 derive newtype instance foldableIdentityT :: Foldable m => Foldable (IdentityT m)
 derive newtype instance traversableIdentityT :: Traversable m => Traversable (IdentityT m)
 
+derive newtype instance MonadST s m => MonadST s (IdentityT m)
+
 instance extendIdentityI :: Extend w => Extend (IdentityT w) where
   extend f (IdentityT m) = IdentityT (extend (f <<< IdentityT) m)
 
diff --git a/src/Control/Monad/List/Trans.purs b/src/Control/Monad/List/Trans.purs
index 41b1e863..aacb08f7 100644
--- a/src/Control/Monad/List/Trans.purs
+++ b/src/Control/Monad/List/Trans.purs
@@ -41,6 +41,7 @@ import Prelude
 import Control.Alt (class Alt)
 import Control.Alternative (class Alternative)
 import Control.Monad.Rec.Class as MR
+import Control.Monad.ST.Class (class MonadST, liftST)
 import Control.Monad.Trans.Class (class MonadTrans, lift)
 import Control.MonadPlus (class MonadPlus)
 import Control.Plus (class Plus)
@@ -325,3 +326,6 @@ instance monadPlusListT :: Monad f => MonadPlus (ListT f)
 
 instance monadEffectListT :: MonadEffect m => MonadEffect (ListT m) where
   liftEffect = lift <<< liftEffect
+
+instance MonadST s m => MonadST s (ListT m) where
+  liftST = lift <<< liftST
diff --git a/src/Control/Monad/Maybe/Trans.purs b/src/Control/Monad/Maybe/Trans.purs
index ac0c97ac..db43fbc8 100644
--- a/src/Control/Monad/Maybe/Trans.purs
+++ b/src/Control/Monad/Maybe/Trans.purs
@@ -14,6 +14,7 @@ import Control.Monad.Cont.Class (class MonadCont, callCC)
 import Control.Monad.Error.Class (class MonadThrow, class MonadError, catchError, throwError)
 import Control.Monad.Reader.Class (class MonadAsk, class MonadReader, ask, local)
 import Control.Monad.Rec.Class (class MonadRec, tailRecM, Step(..))
+import Control.Monad.ST.Class (class MonadST, liftST)
 import Control.Monad.State.Class (class MonadState, state)
 import Control.Monad.Trans.Class (class MonadTrans, lift)
 import Control.Monad.Writer.Class (class MonadWriter, class MonadTell, pass, listen, tell)
@@ -126,3 +127,5 @@ instance semigroupMaybeT :: (Monad m, Semigroup a) => Semigroup (MaybeT m a) whe
 instance monoidMaybeT :: (Monad m, Monoid a) => Monoid (MaybeT m a) where
   mempty = pure mempty
 
+instance MonadST s m => MonadST s (MaybeT m) where
+  liftST = lift <<< liftST
diff --git a/src/Control/Monad/RWS/Trans.purs b/src/Control/Monad/RWS/Trans.purs
index 269c1c26..30610a27 100644
--- a/src/Control/Monad/RWS/Trans.purs
+++ b/src/Control/Monad/RWS/Trans.purs
@@ -15,6 +15,7 @@ import Control.Lazy (class Lazy)
 import Control.Monad.Error.Class (class MonadThrow, class MonadError, throwError, catchError)
 import Control.Monad.Reader.Class (class MonadAsk, class MonadReader)
 import Control.Monad.Rec.Class (class MonadRec, tailRecM, Step(..))
+import Control.Monad.ST.Class (class MonadST, liftST)
 import Control.Monad.State.Class (class MonadState)
 import Control.Monad.Trans.Class (class MonadTrans, lift)
 import Control.Monad.Writer.Class (class MonadWriter, class MonadTell)
@@ -138,3 +139,5 @@ instance semigroupRWST :: (Bind m, Monoid w, Semigroup a) => Semigroup (RWST r w
 instance monoidRWST :: (Monad m, Monoid w, Monoid a) => Monoid (RWST r w s m a) where
   mempty = pure mempty
 
+instance (Monoid w, MonadST s m) => MonadST s (RWST r w s' m) where
+  liftST = lift <<< liftST
diff --git a/src/Control/Monad/Reader/Trans.purs b/src/Control/Monad/Reader/Trans.purs
index 6ad6e635..9c4a33c3 100644
--- a/src/Control/Monad/Reader/Trans.purs
+++ b/src/Control/Monad/Reader/Trans.purs
@@ -15,6 +15,7 @@ import Control.Monad.Cont.Class (class MonadCont, callCC)
 import Control.Monad.Error.Class (class MonadThrow, class MonadError, catchError, throwError)
 import Control.Monad.Reader.Class (class MonadAsk, class MonadReader, ask, asks, local)
 import Control.Monad.Rec.Class (class MonadRec, tailRecM)
+import Control.Monad.ST.Class (class MonadST, liftST)
 import Control.Monad.State.Class (class MonadState, state)
 import Control.Monad.Trans.Class (class MonadTrans, lift)
 import Control.Monad.Writer.Class (class MonadWriter, class MonadTell, pass, listen, tell)
@@ -119,3 +120,6 @@ instance monadRecReaderT :: MonadRec m => MonadRec (ReaderT r m) where
   tailRecM k a = ReaderT \r -> tailRecM (k' r) a
     where
     k' r a' = case k a' of ReaderT f -> pure =<< f r
+
+instance MonadST s m => MonadST s (ReaderT r m) where
+  liftST = lift <<< liftST
diff --git a/src/Control/Monad/State/Trans.purs b/src/Control/Monad/State/Trans.purs
index e6daf3fb..bb56c72d 100644
--- a/src/Control/Monad/State/Trans.purs
+++ b/src/Control/Monad/State/Trans.purs
@@ -16,6 +16,7 @@ import Control.Monad.Cont.Class (class MonadCont, callCC)
 import Control.Monad.Error.Class (class MonadThrow, class MonadError, catchError, throwError)
 import Control.Monad.Reader.Class (class MonadAsk, class MonadReader, ask, local)
 import Control.Monad.Rec.Class (class MonadRec, tailRecM, Step(..))
+import Control.Monad.ST.Class (class MonadST, liftST)
 import Control.Monad.State.Class (class MonadState, get, gets, modify, modify_, put, state)
 import Control.Monad.Trans.Class (class MonadTrans, lift)
 import Control.Monad.Writer.Class (class MonadWriter, class MonadTell, pass, listen, tell)
@@ -142,3 +143,5 @@ instance semigroupStateT :: (Monad m, Semigroup a) => Semigroup (StateT s m a) w
 instance monoidStateT :: (Monad m, Monoid a) => Monoid (StateT s m a) where
   mempty = pure mempty
 
+instance MonadST s m => MonadST s (StateT s' m) where
+  liftST = lift <<< liftST
diff --git a/src/Control/Monad/Writer/Trans.purs b/src/Control/Monad/Writer/Trans.purs
index b5e5fa54..f915c0ac 100644
--- a/src/Control/Monad/Writer/Trans.purs
+++ b/src/Control/Monad/Writer/Trans.purs
@@ -15,6 +15,7 @@ import Control.Monad.Cont.Class (class MonadCont, callCC)
 import Control.Monad.Error.Class (class MonadThrow, class MonadError, catchError, throwError)
 import Control.Monad.Reader.Class (class MonadAsk, class MonadReader, ask, local)
 import Control.Monad.Rec.Class (class MonadRec, tailRecM, Step(..))
+import Control.Monad.ST.Class (class MonadST, liftST)
 import Control.Monad.State.Class (class MonadState, state)
 import Control.Monad.Trans.Class (class MonadTrans, lift)
 import Control.Monad.Writer.Class (class MonadTell, tell, class MonadWriter, censor, listen, listens, pass)
@@ -130,3 +131,5 @@ instance semigroupWriterT :: (Apply m, Semigroup w, Semigroup a) => Semigroup (W
 instance monoidWriterT :: (Applicative m, Monoid w, Monoid a) => Monoid (WriterT w m a) where
   mempty = pure mempty
 
+instance (Monoid w, MonadST s m) => MonadST s (WriterT w m) where
+  liftST = lift <<< liftST