The Open’er Festival is a music festival which takes place on the north coast of Poland, in Gdynia. It is one of the biggest annual music festivals in Poland. The first edition of the festival was organised in Warsaw in 2002 as Open Air Festival. Open’er Festival won the Best Major Festival prize at the European Festivals Awards ceremony in 2009, 2010 and 2019.

The first Open Air Festival was held in Tor Stegny in Warsaw in 2002, with The Chemical Brothers playing on the main stage. The festival then took place in Kościuszki Square in Gdynia from 2003 to 2005. The last festival in Kościuszki Square attracted over 50,000 people. Since 2006, the festival has taken place in Kosakowo Airport (Babie Doły Military Airport) in Gdynia.