La mer may refer to:
- La mer (Debussy), an orchestral composition by Claude Debussy
- La Mer (horse), Champion racehorse
- "La Mer" (song), a song by Charles Trenet, published in 1939 and first recorded by him in 1946
- "Beyond the Sea" (song), the English language version, recorded by many, the best known by Bobby Darin
- "La Mer", a song by Nine Inch Nails from their 1999 album The Fragile
- "La mer", a 2011 song by Jack
- La Mer (cosmetics), a brand of cosmetics owned by Estee Lauder Inc.
- La Mer (film), an 1895 film directed by Louis Lumière