diff --git a/2023/haskell/.gitignore b/2023/haskell/.gitignore
new file mode 100644
index 0000000..4c9e245
--- /dev/null
+++ b/2023/haskell/.gitignore
@@ -0,0 +1,23 @@
+dist
+dist-*
+cabal-dev
+*.o
+*.hi
+*.hie
+*.chi
+*.chs.h
+*.dyn_o
+*.dyn_hi
+.hpc
+.hsenv
+.cabal-sandbox/
+cabal.sandbox.config
+*.prof
+*.aux
+*.hp
+*.eventlog
+.stack-work/
+cabal.project.local
+cabal.project.local~
+.HTF/
+.ghc.environment.*
diff --git a/2023/haskell/aoc2023.cabal b/2023/haskell/aoc2023.cabal
new file mode 100644
index 0000000..cd16626
--- /dev/null
+++ b/2023/haskell/aoc2023.cabal
@@ -0,0 +1,130 @@
+cabal-version:      3.0
+-- The cabal-version field refers to the version of the .cabal specification,
+-- and can be different from the cabal-install (the tool) version and the
+-- Cabal (the library) version you are using. As such, the Cabal (the library)
+-- version used must be equal or greater than the version stated in this field.
+-- Starting from the specification version 2.2, the cabal-version field must be
+-- the first thing in the cabal file.
+
+-- Initial package description 'aoc2023' generated by
+-- 'cabal init'. For further documentation, see:
+--   http://haskell.org/cabal/users-guide/
+--
+-- The name of the package.
+name:               aoc2023
+
+-- The package version.
+-- See the Haskell package versioning policy (PVP) for standards
+-- guiding when and how versions should be incremented.
+-- https://pvp.haskell.org
+-- PVP summary:     +-+------- breaking API changes
+--                  | | +----- non-breaking API additions
+--                  | | | +--- code changes with no API change
+version:            0.0.0.1
+
+-- A short (one-line) description of the package.
+-- synopsis:
+
+-- A longer description of the package.
+-- description:
+
+-- The license under which the package is released.
+license:            MIT
+
+-- The file containing the license text.
+license-file:       LICENSE
+
+-- The package author(s).
+author:             Maciej Jur
+
+-- An email address to which users can send suggestions, bug reports, and patches.
+maintainer:         maciej@kamoshi.org
+
+-- A copyright notice.
+-- copyright:
+build-type:         Simple
+
+-- Extra doc files to be distributed with the package, such as a CHANGELOG or a README.
+extra-doc-files:    CHANGELOG.md
+
+-- Extra source files to be distributed with the package, such as examples, or a tutorial module.
+-- extra-source-files:
+
+common warnings
+    ghc-options: -Wall
+
+library
+    -- Import common warning flags.
+    import:           warnings
+
+    -- Modules exported by the library.
+    exposed-modules:
+      Day01
+      Day02
+
+    -- Modules included in this library but not exported.
+    -- other-modules:
+
+    -- LANGUAGE extensions used by modules in this package.
+    -- other-extensions:
+
+    -- Other library packages from which modules are imported.
+    build-depends:    base ^>=4.17.2.0
+
+    -- Directories containing source files.
+    hs-source-dirs:   src
+
+    -- Base language which the package is written in.
+    default-language: Haskell2010
+
+executable aoc2023
+    -- Import common warning flags.
+    import:           warnings
+
+    -- .hs or .lhs file containing the Main module.
+    main-is:          Main.hs
+
+    -- Modules included in this executable, other than Main.
+    -- other-modules:
+
+    -- LANGUAGE extensions used by modules in this package.
+    -- other-extensions:
+
+    -- Other library packages from which modules are imported.
+    build-depends:
+        base ^>=4.17.2.0,
+        aoc2023
+
+    -- Directories containing source files.
+    hs-source-dirs:   app
+
+    -- Base language which the package is written in.
+    default-language: Haskell2010
+
+test-suite aoc2023-test
+    -- Import common warning flags.
+    import:           warnings
+
+    -- Base language which the package is written in.
+    default-language: Haskell2010
+
+    -- Modules included in this executable, other than Main.
+    -- other-modules:
+
+    -- LANGUAGE extensions used by modules in this package.
+    -- other-extensions:
+
+    -- The interface type and version of the test suite.
+    type:             exitcode-stdio-1.0
+
+    -- Directories containing source files.
+    hs-source-dirs:   test
+
+    -- The entrypoint to the test suite.
+    main-is:          Main.hs
+
+    -- Test dependencies.
+    build-depends:
+        base ^>=4.17.2.0,
+        HUnit ^>=1.6,
+        aoc2023
diff --git a/2023/haskell/app/Main.hs b/2023/haskell/app/Main.hs
new file mode 100644
index 0000000..a4d7240
--- /dev/null
+++ b/2023/haskell/app/Main.hs
@@ -0,0 +1,8 @@
+module Main where
+
+import qualified Day01 (someFunc)
+
+main :: IO ()
+main = do
+  putStrLn "Hello, Haskell!"
+  MyLib.someFunc
diff --git a/2023/haskell/src/Day01.hs b/2023/haskell/src/Day01.hs
new file mode 100644
index 0000000..fdce4b5
--- /dev/null
+++ b/2023/haskell/src/Day01.hs
@@ -0,0 +1,4 @@
+module Day01 (someFunc) where
+
+someFunc :: IO ()
+someFunc = putStrLn "someFunc"
diff --git a/2023/haskell/src/Day02.hs b/2023/haskell/src/Day02.hs
new file mode 100644
index 0000000..94c607e
--- /dev/null
+++ b/2023/haskell/src/Day02.hs
@@ -0,0 +1,4 @@
+module Day02 (xyz) where
+
+xyz :: Int -> Int
+xyz = (+1)
diff --git a/2023/haskell/test/Main.hs b/2023/haskell/test/Main.hs
new file mode 100644
index 0000000..140ca35
--- /dev/null
+++ b/2023/haskell/test/Main.hs
@@ -0,0 +1,24 @@
+module Main (main) where
+
+import Test.HUnit
+import qualified System.Exit as Exit
+import qualified Day02
+
+
+day01 :: Test
+day01 = TestCase $ assertEqual "should return 1" 1 (Day02.xyz 0)
+
+day02 :: Test
+day02 = TestCase $ assertEqual "should return 0" 0 (Day02.xyz 0)
+
+tests :: Test
+tests = TestList
+  [ TestLabel "day 1" day01
+  , TestLabel "assda" day02
+  ]
+
+main :: IO ()
+main = do
+  result <- runTestTT tests
+  if failures result > 0 then Exit.exitFailure else Exit.exitSuccess
+