Mogens Frey Jensen (born 2 July 1941) is a retired Danish amateur cyclist who competed successfully both on the road and on track. He won, along with Gunnar Asmussen, Per Lyngemark and Reno Olsen, a gold medal at the 1968 Summer Olympics in the 4 km team pursuit and finished second individually. However, he is more famous for the way he won stage 9 in the 1970 Tour de France. Here, he defeated his own team captain Joaquim Agostinho.