Berndt Leopold Katter (15 October 1932 – 20 July 2014) was a Finnish former modern pentathlete and Olympic medalist. He thrived at the national level in water-polo (national gold), swimming and fencing.
Besides his sport career, Katter worked in SOK, the Turku Lamp, OPA Ltd, Humppila Glass and Sylvi Salonen Oy's service.
Katter had three children: musician Thomas Katter, Niclas v. Bonsdorff, and Christofer v. Bonsdorff. He was married with textile-artist Riitta Suomi. They lived in Turku.