Gerlach IV of Isenburg-Limburg

Limburg an der Lahn: Castle and Cathedral as seen from the southeast from the northwestern Greifenberg (Griffin Mountain)

Gerlach IV of Isenburg-Limburg (died 1289), also known as Gerlach I of Limburg, was from 1258 Count of (Isenburg-)Limburg, ruling over the town of Limburg an der Lahn and some villages in its hinterlands. He was the founder of the short-lived House of Limburg.