Sosa-Carrillo-Fremont House, Historic adobe museum in downtown Tucson, United States.

The Sosa-Carrillo-Fremont House is a museum housed in a historic adobe building in downtown Tucson, preserving territorial-era architecture. Thick adobe walls and traditional construction methods keep the interiors naturally cool in the desert climate.

The building was constructed in the 1870s as the home of Jose Maria Sosa, a presidio officer, and changed hands when Leopoldo Carrillo purchased it in 1879. Subsequent owners and residents added to its evolving history in the decades that followed.

The house displays furniture and household items from the 1870s, showing how early Tucson families lived and organized their daily routines. These objects reveal the practical details and personal touches that made a house a home during territorial times.

The house stands at 145–153 S Main St in downtown Tucson and is run as a museum by the Arizona Historical Society, which has owned it since 1966. Visitors move through the preserved rooms and the Frémont Room, where artifacts relate to John Charles Frémont, former Territorial Governor of Arizona.

The building has carried three different official names throughout its history, each reflecting the families who owned and shaped it. This naming history reveals how the house remained important to each generation that called it home.