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diff --git a/src/Conftrack/Source/Yaml.hs b/src/Conftrack/Source/Yaml.hs
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+++ b/src/Conftrack/Source/Yaml.hs
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+{-# LANGUAGE DerivingStrategies #-}
+{-# LANGUAGE QuantifiedConstraints #-}
+{-# LANGUAGE ImpredicativeTypes #-}
+{-# LANGUAGE TypeFamilies #-}
+{-# LANGUAGE AllowAmbiguousTypes #-}
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE UndecidableInstances #-}
+
+module Conftrack.Source.Yaml (YamlSource(..), mkYamlSource, mkYamlSourceWith, mkYamlFileSource) where
+
+import Conftrack.Source (SomeSource(..), ConfigSource (..))
+import Conftrack.Source.Aeson
+
+import Prelude hiding (readFile)
+import qualified Data.Aeson as A
+import qualified Data.Yaml as Y
+import Data.Text (Text)
+import qualified Data.Aeson.Text as A
+import qualified Data.Text.Lazy as LT
+import Data.Functor ((<&>))
+import System.OsPath (OsPath)
+import qualified System.OsPath as OS
+import System.File.OsPath (readFile)
+import qualified Data.ByteString as BS
+
+newtype YamlSource = YamlSource JsonSource
+  deriving newtype (ConfigSource, Show)
+
+mkYamlSource :: A.Value -> SomeSource
+mkYamlSource value = mkYamlSourceWith ("Yaml string " <> LT.toStrict (A.encodeToLazyText value)) value
+
+mkYamlSourceWith :: Text -> A.Value -> SomeSource
+mkYamlSourceWith description value = SomeSource (source, [])
+  where source = YamlSource (JsonSource value description)
+
+mkYamlFileSource :: OsPath -> IO (Either Y.ParseException SomeSource)
+mkYamlFileSource path = do
+  bytes <- readFile path <&> BS.toStrict
+  pathAsText <- OS.decodeUtf path <&> LT.toStrict . LT.pack
+  pure $ Y.decodeEither' bytes
+    <&> mkYamlSourceWith ("YAML file " <> pathAsText)
+