The Marin County Amateur Championship is an annual golf tournament held at San Geronimo Golf Course in Marin County. The tournament is a 36-Hole Stroke Play event, which consists of two flights: Championship and Senior (50+). The NCGA awards the Marin County Amateur Championship a 100-point event and the Senior Championship a 150-point event.
The tournament is put on by two local amateurs, Steven Wight and Michael Conklin, who felt that Marin County needed an annual individual golf championship. The inaugural Marin County Amateur was held in September 2008 and consisted of 27 players. In 2012, the tournament had a total of 105 players consisting of three flights: Championship, Senior & Women's. Today, the tournament consists of only a Championship and Senior flight.