| Puerto Rico United | USL Championship, Puerto Rico Soccer League | Aguada | 2007 | Aguada Stadium |
| Puget Sound Gunners FC | USL League Two | — | 2010 | Issaquah High School |
| Pumas FC | National Premier Soccer League | Birmingham | 1999 | — |
| Quad City Eagles | National Premier Soccer League | — | 2010 | — |
| Quality Distributors | Guam Men's Soccer League | Guam | 2001 | — |
| Queen City FC | National Premier Soccer League | — | 2006 | All-High Stadium |
| Queensboro FC | USL Championship | Queens | 12 November 2019 | — |
| Racing Louisville FC | National Women's Soccer League | Louisville | 22 October 2019 | Lynn Family Stadium |
| Raleigh Express | A-League | Raleigh | 1993 | — |
| Rayo OKC | North American Soccer League | Oklahoma City | 2015 | Yukon High School |
| Reading United AC | USL League Two | Reading | 1996 | — |
| Real Boston Rams | USL League Two | — | 2012 | Veterans Memorial Stadium |
| Real Colorado Cougars | USL W-League | — | 2003 | — |
| Real Colorado SC | USL League Two | — | 1986 | — |
| Real Madrid | Puerto Rico Soccer League | — | 2009 | Juan Ramón Loubriel Stadium |
| Real Maryland F.C. | USL League Two | Rockville | 2007 | Richard Montgomery High School |
| Real Phoenix FC | Major Arena Soccer League | Arizona | 2012 | — |
| Real Salt Lake | Major League Soccer | Salt Lake City | 2005 | America First Field |
| Real San Jose | National Premier Soccer League | San Jose | 2007 | PAL Stadium |
| Real Shore F.C. | National Premier Soccer League | — | 2006 | — |
| Red Bull New York | Major League Soccer | Harrison | 1995 | Giants Stadium, Sports Illustrated Stadium |
| Red Force FC | American Premier Soccer League | Miami | 2009 | Tropical Park Stadium |
| Redwood City Ruckus | National Premier Soccer League | — | 2006 | — |
| Reno 1868 FC | USL Championship | Reno | 16 September 2015 | Greater Nevada Field |
| Rhode Island Oceaneers | — | Pawtucket | 1974 | — |
| RI Reds | National Premier Soccer League | Rhode Island | 2012 | — |
| Richmond Kickers | USL League One | Richmond | 1993 | City Stadium |
| Richmond Kickers Academy | U.S. Soccer Development Academy | — | 2008 | — |
| Richmond Kickers Future | USL League Two | — | 2002 | Sports Backers Stadium |
| Rio Grande Valley Bravos FC | USL League Two | — | 2008 | — |
| Rio Grande Valley FC Toros | USL Championship | Edinburg | 15 July 2015 | Robert and Janet Vackar Stadium |
| Rio Grande Valley Ocelots FC | National Premier Soccer League | — | 2010 | — |
| River Cities Futbol Club | Women's Premier Soccer League | — | 2004 | — |
| Rochester Flash | American Soccer League | Rochester | 1981 | Holleder Memorial Stadium |
| Rochester Lady Lancers | — | — | 2017 | Marina Auto Stadium |
| Rochester Lancers | North American Soccer League | Rochester | 1967 | Holleder Memorial Stadium |
| Rochester Lancers | — | Rochester | 2015 | — |
| Rochester Lancers | Major Indoor Soccer League | — | 2010 | Blue Cross Arena |
| Rochester Med City FC | National Premier Soccer League | Rochester | — | — |
| Rochester Ravens | USL W-League | — | 2003 | — |
| Rochester Rhinos | — | Rochester | 1996 | John L. DiMarco Field, Marina Auto Stadium, ESL Ballpark |
| Rochester Thunder | USL League Two | — | 2008 | — |
| Rocket City United | National Premier Soccer League | — | 2007 | — |
| Rockford Rampage | Major Arena Soccer League | — | 2005 | Victory Sports Complex |
| Rovers FC | Guam Men's Soccer League | Guam | 2008 | — |
| RVA FC | National Premier Soccer League | Fredericksburg | 2013 | Sports Backers Stadium |
| Sacramento Geckos | USL Second Division | Sacramento | 1997 | — |
| Sacramento Gold FC | National Premier Soccer League | — | 2009 | — |