Rubidoux (/ˈruːbɪdoʊ/ ROO-bid-oh) was a census-designated place and unincorporated community in Riverside County, California, until July 1, 2011, when it became a neighborhood of the newly formed city of Jurupa Valley.

The city is located within Southern California's Inland Empire region, which is part of the Greater Los Angeles Area.

Along with the rest of Jurupa Valley, Rubidoux has transformed from a rural area of quarries and dairy farms, in mid to late 20th century, to a suburb of the two larger regions.

The Rubidoux neighborhood is immediately west of the city of Riverside, separated by the Santa Ana River, and Mount Rubidoux, a prominent landmark for the area, and a Riverside city park.

Of French Canadian origin, Robidoux's grandfather migrated from Quebec to St. Louis, Missouri, where his interest in the fur trade expanded to become the family business.

Robidoux and his brothers became US citizens after 1803 when St. Louis officially became part of the United States.

Robidoux was also a naturalized Mexican citizen who had served as Alcalde of Santa Fe, New Mexico.

The town of Rubidoux is sited on part of what was once Rancho Jurupa, the Robidoux family ranch.

On March 8, 2011, voters of Rubidoux and adjoining towns passed Measure A by a 54% "Yes" vote, to incorporate the areas of Mira Loma, Pedley, Rubidoux, Glen Avon, and Sunnyslope into the new city of Jurupa Valley.

(Z): Area returned as West Riverside At the 2010 census Rubidoux had a population of 34,280.