Alessandra "Leka" Vieira (born March 14, 1976) is a submission grappler and a 6th degree Brazilian jiu-jitsu practitioner and coach.

[a] Widely regarded as one of the pioneers of women's Brazilian jiu-jitsu, she became in 1999 the first-ever female black belt World champion.

[1] Alessandra Vieira de Souza was born on March 14, 1976, in São Pedro dos Ferros, Minas Gerais, Brazil.

[4] She was promoted to blue belt after six months of training and two years later was a finalist at the 1994 Brazilian National Championship winning silver.

[2] In March 2022, she received her 6th degree from Léo Vieira,[3][17] and was inducted in the United States Martial Art Hall of Fame.