Ott Arder (February 26, 1950, in Tallinn – June 26, 2004, in Kassari) was an Estonian poet, children's writer and translator. He was also the author of several popular songs and written texts.
From 1990, he was a member of the Estonian Writers' Union. His younger brother, Jaan Arder is a musician.
Arder was found dead on 26th June 2004 on the beach in Kassari.