Will a PAL Version of Call of Duty: Modern Warfare Work on an Xbox 360 in Ireland?

Yes, absolutely. You are in luck!

PAL stands for Phase Alternating Line, the analog television encoding standard used across Europe, including Ireland. Since you are in Ireland, a PAL version of Call of Duty: Modern Warfare for Xbox 360 will work perfectly on your console.

Why it works:

• Xbox 360 is Region-Free for Games: Unlike DVDs or earlier consoles, the Xbox 360 does not enforce region locking on game discs based on PAL/NTSC. You can play games from any region.
• Display Compatibility: The game disc is authored for the PAL video standard (50Hz/60Hz), which matches Irish TVs and the console's output capabilities.

You can purchase and play the game without any issues.