Maria Alida Catharina "Marjan" Janus (born 31 January 1952) is a former breaststroke swimmer from the Netherlands.

In 1968, she won the 100 m breaststroke event at the national championships, beating the long-time favorite Klenie Bimolt.

[1] She was therefore selected for the 1968 Summer Olympics, but failed to reach the final.

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