 Thomas M. Robbins (1801–1854) was a Nantucket, Massachusetts sea captain who came to California in 1823.Robbins married Maria Encarnacion Carrillo (1814-1876), daughter of Carlos Antonio Carrillo, in Santa Barbara in 1834.In July 1846, Robbins added the additional half square league grant "Las Positas" given to him by Pio Pico.