Lydia Evgenevna Kavina (Russian: Лидия Евгеньевна Кавина; born 8 September 1967) is a British-Russian theremin player, based in Oxfordshire, UK.

Kavina has appeared as a solo performer at such prestigious venues as the Royal Albert Hall in London, Elbphilharmonie in Hamburg, Royal Concertgebouw in Amsterdam, Bolshoi Zal (Great Hall) of the Moscow Conservatory, Moscow International Art Centre with National Philharmonic of Russia under Vladimir Spivakov and Bellevue Palace in Berlin, the residence of the German President.

She was also featured in stage productions such as Alice and The Black Rider (both conceived and directed by Robert Wilson, with music by Tom Waits) at the Thalia Theater in Hamburg, and in collaboration with the Russian experimental surf band Messer Chups.

Her recent project Nicht zu fassen for theremin and accordion, together with Roman Yusipey, includes works by S.Gubaidulina, J.Cage, V.Poleva, as well as Kavina's compositions, it was performed in Germany and Ukraine.

In collaboration with Barbara Buchholz and Kamerensemble Neue Musik Berlin, Kavina performed a number of concerts of contemporary works for theremin in Germany in 2005–2007 as part of the Touch!