St. Gertrude Old Church (Latvian: Vecā Svētās Ģertrūdes Evaņģēliski luteriskā baznīca) is a Lutheran church in Riga, the capital of Latvia. It is a parish church of the Evangelical Lutheran Church of Latvia. The church is situated at the address 6 Ģertrūdes Street. It has a long association with Riga's German ethnic community, and the congregation worship in the German language.

The church is located in a suburb of Riga, historically outside the main city walls, and thus unprotected in times of war or siege.