Matsalu Nature Film Festival (, abbreviated MAFF) is an Estonian film festival which is focused on nature films.
MAFF predecessors were Nature Film Days, which took place 1983-1989 in Tallinn, and was led by Rein Maran.
First MAFF took place in 2003. The first MAFF lasted 3 days and 23 films from 7 countries were shown.
In 2019, over 1,000 films from 80 countries were shown.