Lenna Kuurmaa (born September 26, 1985) is an Estonian singer-songwriter and actress. She is a member of the girl group Vanilla Ninja, but after the band's hiatus since 2009, continued to work as a solo-artist. She also formed a band with the name "Lenna" who released the debut album Lenna in June 2010.

From 1990 to 2002, Lenna Kuurmaa was a member of the ETV Lasteekraani Muusikastuudio and performed together with the choir in many festivals internationally (in Italy, the Netherlands, Finland, Denmark, Norway, Israel, the United Kingdom, Spain, USA and Russia). She studied violin in Tallinn Music School from 2000 to 2006 under teacher Urvo Uibokand. She received vocal training from Ester Lepa and Ludmilla Issakova 1997–2002. In 2002 she took part of televised singing contest Fizz Superstar, where she made it to the quarter-finals. In the same year Kuurmaa, together with 3 other girls, formed the rock band Vanilla Ninja. After Vanilla Ninja's hiatus in 2009, Lenna Kuurmaa started working as a solo-musician with the artist-name Lenna. In June 2010, she released her debut album Lenna under Mortimer Snerd. All of the songs were written together with and produced by Vaiko Eplik, who is also the owner of the record label. Her band also performed at the 2010 Shanghai EXPO.

Kuurmaa played the second lead role of Maya in the year 2007 Estonian film Kuhu põgenevad hinged (Where Souls Go) and Angela in the Estonian soap opera Kodu keset linna, also in 2007. Since 2008, Kuurmaa has taken part in Theatre NO99's play Pericles as a guest-actress. In 2010, she was given a role of an Estonian Security Police investigator in the crime-drama series Kelgukoerad. She has stated that she has no interest in pursuing professional acting education.

She has a role in the 2012 Finnish movie Vuosaari, named after a particular district in Helsinki and the same year appeared as Pille in the Peeter Simm-directed drama Üksik saar. From 2012 until 2014, she appeared as Anne in the Kanal 2 comedy series Tupiktänava mehed. In 2017, Kuurmaa began appearing in the role of Ramilda Martin on the Estonian TV3 crime-comedy series Kättemaksukontor.