Rhymester (ライムスター, Raimu Sutā) is a Japanese hip hop group consisting of MCs Mummy-D and Utamaru, and DJ Jin.

They debuted on an independent label in 1993 with the EP Ore ni Iwaserya (俺に言わせりゃ), which was panned by critics.

In 2001, the group made their major label debut when they signed onto Ki/oon Records, a sublabel of Sony Music Entertainment Japan.

On March 3, 2007, the group performed solo at the Nippon Budokan, almost 20 years after their original debut.

Rhymester has released several songs such as "B-Boyism" (B-BOYイズム), "Mimi wo Kasubeki" (耳ヲ貸スベキ), "King Of Stage", "Nikutai-Kankei" (肉体関係) and more.