Mary Beatrice Klass (born 16 May 1935) is a Singaporean former sprinter.

She competed in the women's 100 metres at the 1956 Summer Olympics.

[1] Klass won a silver medal in the 100 metres at the 1954 Asian Games.

[2] In 2016, Klass was inducted to the Singapore Women's Hall of Fame.

[2] This biographical article relating to Singaporean athletics is a stub.