Simon III of Sponheim-Kreuznach

Simon III (born after 1330; died 30 August 1414) was the last ruling count of the Sponheim-Kreuznach line and, through marriage, count of Vianden. The only son of Walram, he married Maria of Vianden in 1348, bringing the county of Vianden to his house.

In 1371 he was captured and held for years until a heavy ransom freed him. His son Walram died in 1382, and the male line of the Kreuznach counts ended with Simon's death in 1414.