Mary Kok (born 1940) is a renowned Dutch swimmer.

Between 1954 and 1957 she set ten world records from the young age of 15 to 17 years: Kok was to swim in the 1956 Summer Olympics in Melbourne for the Dutch Olympic Team until the night before she was to depart when the Netherlands boycotted the competition over Russia's invasion of Hungary[2] In 2016 Kok, along with other athletes whose athletic careers were affected by the boycott were honoured by the Hungarian government.

Kok said in her speech, she had always felt that her gold medal was at the bottom of the swimming pool in Melbourne, but that the Hungarian people gave her the feeling that the honorary medal was given to her wholeheartedly.

[6] In 2015, Kok was invited by the Dutch Sports Federation to be recognised at their annual Athlete of the Year event.

This biographical article related to a Dutch swimmer is a stub.