Kaasin, daughter of Prella was a Klingon female who lived in the 24th century. By the 2340s, Kaasin was married to Mogh, son of Worf, and the mother of two sons, Worf and Kurn. (TLE novel: The Art of the Impossible)

Kaasin and her family resided on Khitomer in the mid-2340s, where she trained as a mok'bara master and took pride in her ability to protect herself and her children. Unfortunately, both Kaasin and Mogh were killed by the Romulans in the Khitomer Massacre of 2346. (TLE novel: The Art of the Impossible)

Author Keith R.A. DeCandido named Kaasin for Elisa J. Kassin, a former editor at Pocket Books