Juhani Kari Kalervo Avellan (born (1945-12-13)13 December 1945 in Riihimäki - (2004-07-28)28 July 2004 in Helsinki) was a Finnish male weightlifter, who competed in the light heavyweight class and represented Finland at international competitions.
He won the bronze medal at the 1975 World Weightlifting Championships in the 82.5 kg category.
He participated at the 1972 Summer Olympics in the 82.5 kg event, at the 1976 Summer Olympics in the 82.5 kg event and at the 1980 Summer Olympics in the 82.5 kg event.
He won the bronze medal at the 1975 European Championships in the Light-Heavyweight class (350.0 kg).
He set three light-heavyweight world records in 1970-71 – one in the snatch and one in the clean & jerk.