Save Location[]
On Windows: shell:personal\My Games\Sid Meier's Civilization 5\Saves
On Mac OS X: ~/Documents/Aspyr/Sid Meier's Civilization 5/Saves or ~/Library/Application Support/Sid Meier's Civilization 5/Saves
On Linux: ~/.local/share/Aspyr/Sid Meier's Civilization 5/Saves
For more information on Civilization V, see the Civilization Games Wiki.