| UFO | OK | Tulsa | | |
| Ultra-sex Alliance (women) | MI | Ann Arbor | 1993 | |
| Un Cut | TX | Dallas | | |
| Uncircumcised Society of America (USA) | CA | San Francisco | | |
 | Uncommon Bonds | New Zealand | Christ Church | | |
 | Uncommon Ground | CO | Denver | 1996 | |
| Uncut Club | CA | Los Angeles | | |
| Unicorn | WI | Madison | 1991 | |
 | Unicorn (Later Atlantis MC) | GA | Atlanta | 1971 | |
 | Unicorn MC | OH | Cleveland | 1971 | |
 | United Leatherfolk of Connecticut | Connecticut | | 1990 | |
 | Universal Brotherhood Leather Lords | AZ | Phoenix | | |
 | Upstate boys of Leather | New York | | | |
 | Urania (women) | MA | Somerville | | |
| Ursine Groups, The (TUG) | IO | Ankeny | | |
| Ursus | OH | dayton | 1992 | |
 | Utah Bear Alliance | UT | Salt Lake City | | |
 | Utah Power Exchange | Utah | | | |
 | Utica Kink Society | | | 2000 | |
 | Utah Power Play | UT | Salt Lake City | | |
 | Utica Tris MC | NY | New York | 1986 | |
 | UYA MC | New York | | 1969 | |