Machynlleth Comedy Festival is a three-day comedy festival held annually in Machynlleth, Wales. Although the town is home to only around 2,000 residents, in 2024 the festival drew in around four times that number of visitors. The festival, nicknamed "Mach Fest" by its supporters, is aimed as a testing ground for comedians to experiment with new material in the spring before the more intense Edinburgh Fringe Festival in August.