Leijn Loevesijn (born 2 January 1949) is a former Dutch cyclist.

At the 1968 Summer Olympics Loevesijn, together with Jan Jansen won a silver medal in the 2000 metres tandem race, and finished fifth at the sprint race and sixth in the time trial. At the Track Cycling World Championships he won a bronze medal in the sprint in 1970 and a gold medal in the sprint in 1971. Between 1968 and 1976 he won 11 national titles in sprint disciplines.

After that he became a professional. In 1971 he was World Champion Sprint. He was the first Dutch World Champion since Jan Derksen in 1957, and it would take until 2004 before Theo Bos would succeed him. Loevesijn was eight times in a row Dutch Champion sprint en won the "Grote Prijs van Amsterdam" three times.

He ended his career as a professional cyclist in 1976. Afterwards, he tried to combine his cycling activities with his work but in vain. Until his retirement in 2014 Leijn Loevesijn performed as a planning engineer with the water management and sewage services of the city of Amsterdam. Currently he is indirectly involved in cycling.

Teams 1969: Batavus - Continental - Alcina 1970: Flandria - Mars 1971: TI - Carlton 1972: Raleigh 1973: Raleigh 1974: TI - Raleigh 1975: G.G.M.C. - Eskagé 1976: G.G.M.C. - Eskagé 1979: individual

Victories 1968 NK 1 km timetrial, amateurs NK Tandem, amateurs; with Jan Jansen 2e in Olympic Games, Tandem; with Jan Jansen

1969 NK Baan, Sprint, Profs NK track race (50 km)

1970 NK Baan, Sprint, Profs

1971 NK Baan, Sprint, Profs World Champion track, Sprint, Elite

1972 NK Baan, Sprint, Profs

1973' NK Baan, Sprint, Profs

1974 NK Baan, Sprint, Profs

1975 NK Baan, Sprint, Profs

1976 NK Baan, Sprint, Profs

See also List of Dutch Olympic cyclists

External links Loeveseijn and Jansen about the Mexico Olympic Games, interview in Met het Oog op Morgen, 6 augustus 2012

References