Katrin Käärt (married name Kubja; born 10 October 1983) is an Estonian athletics competitor. She was born in Kohtla-Järve. She began his athletics career in 1944, coached by his father. She is multiple-times Estonian champion in different athletics disciplines. 1998–2006 she was a member of Estonian national athletics team. Her personal best in 400 m is 53,61 (2004).