Reidar Lorentzen (born 22 September 1956) is a Norwegian javelin thrower.
He was born in Hammerfest, and represented the club IK Tjalve.
[2] Representing the club IK Tjalve, Lorentzen won three national titles in javelin throw, in 1988, 1989 and 1991.
His personal best is 80.06 meter, which was also the Norwegian record in javelin throw until 1996.
He competed in javelin throw at the 1984 Summer Olympics in Los Angeles.