Ig Henneman (born 21 December 1945) is a Dutch composer and bandleader. She was born in Haarlem, Netherlands, and took music lessons as a child. She studied viola and violin in Amsterdam and Tilburg, and composition with Robert Heppener.
After completing her studies, Henneman worked as a violist in orchestras, and then co-founded the rock band FC Gerania where she began to compose. In 1985 she founded the Ig Henneman Quintet. She also improvises on viola with Henneman Sextet, Duo Baars-Henneman with Ab Baars and the Queen Mab Trio.