What is is you're trying to do?
IronAHK should work on a Mac - I'm not a Mac user so I've not tried it, but that would be my first choice for trying to get AutoHotkey scripts working.
alternativeTo.net lists a few Mac OS alternatives to AutoHotkey. The top result there is Project SIKULI which looks pretty similar to AHK in terms of features but with a different scripting language.