The MAMA Award for Best OST is an award presented annually by CJ E&M Pictures (Mnet) at the MAMA Awards. It was first awarded at the 2004 Mnet KM Music Video Festival; Jo Sungmo won the award for his song "By Your Side" for the drama series Lovers in Paris, and is given in honor for the performers with the best soundtrack for a television series.

The 2004 Mnet KM Music Video Festival (MKMF) was the sixth of the annual music awards in Seoul, South Korea, that took place on December 4, 2004, at the Kyung Hee University.