San Diego United was an American soccer team based in San Diego, California, that competed in the National Premier Soccer League (NPSL), a national amateur league at the fourth tier of the American soccer pyramid.

As of 2010, neither the Southwest Division nor SD United are listed as being part of NPSL.

The team's colors were black, white, red and gold.

The team had a sister organization, also called San Diego United, in the Women's Premier Soccer League.

Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply.