Cornelis Wilhelmus Pieter "Cor" Vriend (born 8 November 1949) is a former long-distance runner from the Netherlands, who mainly competed in the marathon.

He participated in two consecutive Summer Olympics for his native country; in 1980 (Moscow, 41st place) and 1984 (Los Angeles, 39th place).

[1] During the early 1980s he was overshadowed by his fellow countryman Gerard Nijboer.

He is the Dutch record holder for the relatively obscure 25,000 m and 30,000 m track events, both of which he set on 22 August 1981.

This biographical article relating to Dutch athletics is a stub.