Where are my Minecraft saves located?

As the Minepedia mentions, your save files are in:

~/Library/Application Support/minecraft/saves/

If you were running Linux, it'd just be:

~/.minecraft/saves

If you were running Windows, instead, it'd be:

%APPDATA%\.minecraft\saves\

In all cases, you can reach the correct folder easily with your file manager of choice using this little trickery:

  1. Start Minecraft
  2. Choose "Mods and Texture packs"
  3. Choose "Open texture pack folder"
  4. Go up a level
  5. Open the saves directory.