The Rumsen language is one of eight Ohlone languages, historically spoken by the Rumsen people of Northern California. The Rumsen language was spoken from the Pajaro River to Point Sur, and on the lower courses of the Pajaro, as well as on the Salinas and Carmel Rivers, and the region of the present-day cities of Salinas, Monterey and Carmel.

The Ohlone languages, also known as Costanoan, form a small Indigenous language family historically spoken in Northern California, both in the southern San Francisco Bay Area and northern Monterey Bay area, by the Ohlone people. Along with the Miwok languages, they are members of the Utian language family. The most recent work suggests that Ohlone, Miwok, and Yokuts are branches of a Yok-Utian language family.