John II, Count of Sayn

John II of Sayn (c. 1270 – 23 November 1324) was the son of Count Godfrey I of Sponheim-Sayn and Jutta of Isenburg. His father died on 31 October 1283 and he inherited the County of Sayn the following year; his brother Engelbert I took Homburg and founded the Sayn-Homburg line.

His heir Godfrey was born to his wife Elizabeth of Hesse, and he also left a younger son, John. John II ruled Sayn until his death in November 1324.