diff --git a/src/GitHub/Data/GitData.hs b/src/GitHub/Data/GitData.hs
index edeef245..b45ec202 100644
--- a/src/GitHub/Data/GitData.hs
+++ b/src/GitHub/Data/GitData.hs
@@ -71,6 +71,25 @@ data GitTree = GitTree
 instance NFData GitTree where rnf = genericRnf
 instance Binary GitTree
 
+data NewTree = NewTree
+    { newBaseTree :: !(Name Tree)
+    , newTreeGitTrees :: !(Vector NewGitTree)
+    }
+  deriving (Show, Data, Typeable, Eq, Ord, Generic)
+
+instance NFData NewTree where rnf = genericRnf
+instance Binary NewTree
+
+data NewGitTree = NewGitTree
+    { newGitTreePath :: !Text
+    , newGitTreeMode :: !Text
+    , newGitTreeContent :: !Text
+    }
+  deriving (Show, Data, Typeable, Eq, Ord, Generic)
+
+instance NFData NewGitTree where rnf = genericRnf
+instance Binary NewGitTree
+
 data GitCommit = GitCommit
     { gitCommitMessage   :: !Text
     , gitCommitUrl       :: !URL
@@ -85,6 +104,16 @@ data GitCommit = GitCommit
 instance NFData GitCommit where rnf = genericRnf
 instance Binary GitCommit
 
+data NewGitCommit = NewGitCommit
+    { newGitCommitMessage   :: !Text
+    , newGitCommitTree      :: !(Name Tree)
+    , newGitCommitParents   :: !(Vector (Name GitCommit))
+    }
+  deriving (Show, Data, Typeable, Eq, Ord, Generic)
+
+instance NFData NewGitCommit where rnf = genericRnf
+instance Binary NewGitCommit
+
 data Blob = Blob
     { blobUrl      :: !URL
     , blobEncoding :: !Text
@@ -218,6 +247,9 @@ instance FromJSON Commit where
         <*> o .:? "files" .!= V.empty
         <*> o .:? "stats"
 
+instance ToJSON NewGitCommit where
+    toJSON (NewGitCommit message tree parents) = object [ "message" .= message, "tree" .= tree, "parents" .= parents  ]
+
 instance FromJSON Tree where
     parseJSON = withObject "Tree" $ \o -> Tree
         <$> o .: "sha"
@@ -233,6 +265,12 @@ instance FromJSON GitTree where
         <*> o .: "path"
         <*> o .: "mode"
 
+instance ToJSON NewTree where
+    toJSON (NewTree b tree) = object [ "base_tree" .= b, "tree" .= tree  ]
+
+instance ToJSON NewGitTree where
+    toJSON (NewGitTree path mode content) = object [ "path" .= path, "mode" .= mode, "content" .= content  ]
+
 instance FromJSON GitCommit where
     parseJSON = withObject "GitCommit" $ \o -> GitCommit
         <$> o .: "message"
diff --git a/src/GitHub/Endpoints/GitData/Commits.hs b/src/GitHub/Endpoints/GitData/Commits.hs
index 1d8ced18..ae4af165 100644
--- a/src/GitHub/Endpoints/GitData/Commits.hs
+++ b/src/GitHub/Endpoints/GitData/Commits.hs
@@ -7,7 +7,10 @@
 -- <http://developer.github.com/v3/git/commits/>.
 module GitHub.Endpoints.GitData.Commits (
     commit,
+    commit',
     gitCommitR,
+    createCommit,
+    createCommitR,
     module GitHub.Data,
 ) where
 
@@ -18,13 +21,30 @@ import Prelude ()
 
 -- | A single commit, by SHA1.
 --
+
+-- > reference' (Just $ BasicAuth "github-username" "github-password") "mike-burns" "github" "heads/master"
+commit' :: Maybe Auth -> Name Owner -> Name Repo -> Name GitCommit -> IO (Either Error GitCommit)
+commit' auth user repo sha =
+    executeRequestMaybe auth $ gitCommitR user repo sha
+
 -- > commit "thoughtbot" "paperclip" "bc5c51d1ece1ee45f94b056a0f5a1674d7e8cba9"
 commit :: Name Owner -> Name Repo -> Name GitCommit -> IO (Either Error GitCommit)
-commit user repo sha =
-    executeRequest' $ gitCommitR user repo sha
+commit =
+    commit' Nothing
 
 -- | Query a commit.
 -- See <https://developer.github.com/v3/git/commits/#get-a-commit>
 gitCommitR :: Name Owner -> Name Repo -> Name GitCommit -> Request k GitCommit
 gitCommitR user repo sha =
     query ["repos", toPathPart user, toPathPart repo, "git", "commits", toPathPart sha] []
+
+-- | Create a tree.
+createCommit :: Auth -> Name Owner -> Name Repo -> NewGitCommit -> IO (Either Error GitCommit)
+createCommit auth user repo newTree =
+    executeRequest auth $ createCommitR user repo newTree
+
+-- | Create a commit.
+-- See <https://developer.github.com/v3/git/refs/#create-a-reference>
+createCommitR :: Name Owner -> Name Repo -> NewGitCommit -> Request 'RW GitCommit
+createCommitR user repo newCommit =
+     command Post  ["repos", toPathPart user, toPathPart repo , "git", "commits"] (encode newCommit)
\ No newline at end of file
diff --git a/src/GitHub/Endpoints/GitData/Trees.hs b/src/GitHub/Endpoints/GitData/Trees.hs
index b6bc550a..89ba9487 100644
--- a/src/GitHub/Endpoints/GitData/Trees.hs
+++ b/src/GitHub/Endpoints/GitData/Trees.hs
@@ -12,6 +12,8 @@ module GitHub.Endpoints.GitData.Trees (
     nestedTree,
     nestedTree',
     nestedTreeR,
+    createTree,
+    createTreeR,
     module GitHub.Data,
     ) where
 
@@ -57,3 +59,14 @@ nestedTree = nestedTree' Nothing
 nestedTreeR :: Name Owner -> Name Repo -> Name Tree -> Request k Tree
 nestedTreeR user repo sha =
     query  ["repos", toPathPart user, toPathPart repo, "git", "trees", toPathPart sha] [("recursive", Just "1")]
+
+-- | Create a tree.
+createTree :: Auth -> Name Owner -> Name Repo -> NewTree -> IO (Either Error Tree)
+createTree auth user repo newTree =
+    executeRequest auth $ createTreeR user repo newTree
+
+-- | Create a tree.
+-- See <https://developer.github.com/v3/git/refs/#create-a-reference>
+createTreeR :: Name Owner -> Name Repo -> NewTree -> Request 'RW Tree
+createTreeR user repo newTree =
+     command Post  ["repos", toPathPart user, toPathPart repo , "git", "trees"] (encode newTree)
\ No newline at end of file