The Experimental Aircraft Association (EAA) is an international organization of aviation enthusiasts based in Oshkosh, Wisconsin. Since its inception, it has grown internationally with over 200,000 members and nearly 1,000 chapters worldwide. It hosts the largest aviation gathering of its kind in the world, EAA AirVenture Oshkosh.

Oshkosh is a city in and the county seat of Winnebago County, Wisconsin, United States. The city had a population of 66,816 in 2020, making it the ninth-most populous city in Wisconsin. It is also adjacent to the much less populous Town of Oshkosh in the north.