Klaus-Dieter Sieloff, German footballer (d. 2011)

Klaus-Dieter Sieloff (27 February 1942 – 13 December 2011) was a German footballer who played as a defender. He spent 11 seasons in the Bundesliga with VfB Stuttgart and Borussia Mönchengladbach. He played in two World Cup Qualifying matches in 1966.