Katariina Tamm (born March 2, 1989) is an Estonian actress.

In 2007, Katariina Tamm graduated from the theater class of the Tallinn Old Town College of Education, supervised by Lembit Peterson, and in 2011 from the Turku Art Academy, majoring in puppetry. She has also studied as an exchange student at the Physical Theater Department of the Barcelona Theater Institute. From autumn 2016 to 2019, she studied and lived in London, where she obtained a master's degree from the Royal Academy of Dramatic Art (RADA), one of the oldest theater schools in England.

In 2011-2016, she worked as an actor at NUKU Theatre. Since 2012, she has participated in the activities of the theater group Frank. While living in England, she played at the New Public Theater. In the years 2020-2022, Katariina Tamm was an actor at the Von Krahl Theater as a member of the joint troupe of Exepdition and the Von Krahl Theater. Since 2023, she has been an actor in the Expedition troupe.