Harriet Toompere (born May 22, 1975) is an Estonian stage, television, and film actress. She is also the author of two children's books.

Harriet Toompere was born in Tallinn to actor and director Hendrik Toompere Sr. and actress Maie Toompere (née Kruusenberg). Her older brother is actor Hendrik Toompere Jr., and her nephew is actor Hendrik Toompere Jr. Jr. Her maternal grandfather was wrestler Herman Kruusenberg.

She studied acting at the EMA Higher Drama School (now, the Estonian Academy of Music and Theatre), graduating in 1998. Among her graduating classmates were actors Hilje Murel, Jan Uuspõld, Tiit Sukk, Veikko Täär, Liina Vahtrik, and Andero Ermel. Her diploma productions at the EMA Higher Drama School were in stage performances in Betti Alver's Lugu valgest varesest in 1996, Alan Jay Lerner and Frederick Loewe's My Fair Lady in 1997, and Madis Kõiv's Peiarite õhtunäitus, also in 1997.