English UsageGrammar guide
Plural of Forum
“Forum” has two dictionary-recorded plurals: “forums” and “fora.” The regular plural is common in general use, while the Latin-derived plural survives especially in more formal or specialized contexts.
Both “forums” and “fora” are accepted plurals of “forum.” Use the form expected by your audience or house style; “forums” is the straightforward regular English plural.
Key details
Confusion Familycompeting plural forms
Rule Familynumber and classical plurals
Termsforum, forums, fora
Variant ScopeCambridge records plural “forums” or “fora.”
Further guidance
Core difference
Both “forums” and “fora” are accepted.
Fast Test
Use “forums” for an ordinary regular-English plural unless a field or house style favors “fora.”
Usage Boundary
Do not present “fora” as the only correct plural or mark “forums” as an error.
Sources and evidence
Sources are shown with the role they play in this guide. Historical or style-sensitive claims are kept within the evidence boundary described above.
- Forum — Cambridge Dictionary (opens in a new tab)Cambridge University Press · Direct dictionary evidence that “forum” has accepted plurals “forums” and “fora.”