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.

He was the first Dutch World Champion since Jan Derksen in 1957, and it would take until 2004 before Theo Bos would succeed him.

Until his retirement in 2014 Leijn Loevesijn performed as a planning engineer with the water management and sewage services of the city of Amsterdam.

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