Kyasht was born in 1885. She studied at the St Petersburg Imperial Ballet School with Pavel Gerdt and joined the Maryinsky Theatre in 1902, becoming second dancer in 1905 and first dancer in 1908. She was also a soloist with the Bolshoi (1903-4) and performed in various concert recitals. In 1908 she went to London where she succeeded Adeline Genee as prima ballerina at the Empire Theatre, performing there for several seasons until 1913. In 1912 she also danced with Diaghilev's Ballets Russes (and again in 1919), and made her New York debut in 1914. After returning to Russia to dance concert performances (1914-17) she settled in London and founded her own school (which moved to Cirencester in 1948) while also dancing in cabaret and the theatre. In 1939 she founded her own company, Ballet de la Jeunesse Anglaise, which toured England (1939) and Europe (1944) and in 1940 also ran the Lydia Kyasht Ballet. From 1953 she also taught at the Legat School. She died in 1959.