| FUN | F*** Up New 
| Others |
| FUN | Faculty for Undergraduate Neuroscience
| Others |
| FUN | Fairly Under Normal
| Others |
| FUN | Fairly Unique Name
| Others |
| FUN | Faith Unction And Nurture
| Others |
| FUN | Falkland Unspoilt Naturals
| Others |
| FUN | Families Understanding Nature
| Others |
| FUN | Families United for Novak
| Others |
| FUN | Families United Network
| Others |
| FUN | Families United Now
| Others |
| FUN | Family Unit Network
| Others |
| FUN | Family Unity Network
| Others |
| FUN | Family Unity Night
| Others |
| FUN | Family Unschoolers Network
| Others |
| FUN | Fantasy Uber Nation
| Others |
| FUN | Feel Unity Now
| Others |
| FUN | Fellini Udall Newport
| Others |
| FUN | Fellowship Unity Nourishment
| Others |
| FUN | Filipino Unification and Networking
| Others |
| FUN | Finally Understanding Nothing
| Others |
| FUN | Finally Understnding Nothing
| Others |
| FUN | Finding Urban Nature
| Others |
| FUN | Fitness and Understanding Nutrition
| Others |
| FUN | FL4 Uniform Network
| Others |
| FUN | Flexible Unified Negavirality
| Others |
| FUN | Flordia United Numismatists
| Others |
| FUN | Florida United Numismatists
| Others |
| FUN | Follow Up Networking
| Others |
| FUN | For Unlawful Nowledge
| Others |
| FUN | Freaking Unbelievably Nuts
| Others |
| FUN | Free mode Users of Nigeria
| Others |
| FUN | Free Underground Network
| Others |
| FUN | Free Unstressed Nights
| Others |
| FUN | Free Utilities Network
| Others |
| FUN | Frente de Unidad Nacional
| Others |
| FUN | Frente Unidad Nacionalista
| Others |
| FUN | Friday Uth Night
| Others |
| FUN | Fried Unusual Nourishment
| Others |
| FUN | Friends Understanding Nutrition
| Others |
| FUN | Friends United in Networking
| Others |
| FUN | Friends, U and me, aNywhere
| Others |
| FUN | Friendship Understanding New
| Others |
| FUN | Friendship, Unity, and Nobleness
| Others |
| FUN | Frizzy University Network
| Others |
| FUN | Frizzy's University Network
| Others |
| FUN | Frizzys University Network
| Others |
| FUN | Fuk U Noobs
| Others |
| FUN | Funafuti Atoll, Tuvalu
| Others |
| FUN | Function Unknown Now
| Others |
| FUN | Fund a Ugandan Nurse
| Others |
| FUN | Fundamentally Unsound Nouns
| Others |
| FUN | Funky University Nutters
| Others |
| FUN | Further Underpinning for Novices
| Others |