Lennart Per-Olav Hedmark (born 18 May 1944) is a retired Swedish track and field athlete who competed in the decathlon.

[1] He started his career as a javelin throw specialist and claimed three straight titles in the event at the Swedish Championships from 1963 to 1965.

[1] International medals came at the 1970 Summer Universiade, where he took the silver behind Mykola Avilov,[3] and at the 1971 European Athletics Championships, finishing as runner-up to the defending champion Joachim Kirst.

[1] Although he never won a major title, Hedmark's career was one of the most prolific as he competed in a total of 76 combined events competitions.

This was the greatest number ever for a top level athlete at the time and remains among the highest totals; Kip Janvrin bettered this achievement and was himself succeeded by Roman Šebrle, who completed over 100 appearances.