Waldemar Blatskauskas (17 March 1938 – 6 March 1964), also known simply as Waldemar, was a Brazilian professional basketball player.

During his pro career, Blatskauskas played with the Brazilian clubs Regatas Campinas, Tietê, São Carlos Clube, and XV de Novembro de Piracicaba.

[citation needed] Blatskauskas was a member of the senior Brazilian national basketball team that won gold medals at the 1959 FIBA World Championship, and the 1963 FIBA World Championship.

With Brazil, he also won a bronze medal at the 1960 Summer Olympic Games.

[citation needed] Blatskauskas died in Brazil, in a traffic accident, on 6 March 1964.