Jan Ivar "Janne" Halvarsson (born 26 December 1942) is a retired Swedish cross-country skier.
He competed at the 1968 Winter Olympics in the 15, 30, 50 and 4×10 km events and won a silver medal in the relay, finishing fifth in the 15 km and seventh in the 50 km.
He won a bronze medal in the 4×10 km relay at the 1970 FIS Nordic World Ski Championships.During his skiing career Halvarsson was known for his waxing skills.
Therefore, after retiring he was invited to cover this area at the Swedish national team, but left after quarrels with the skiing federation.