The Ten Year Society is an informal grouping of editors who have been contributing to the Wikipedia project for ten years or more (from 22 March 2014 or earlier). It exists so that editors can celebrate a decade of contributing to a project they are passionate about, to help long-time participants in the encyclopedia find each other, and to allow them to share perspectives and expertise. It is not intended as a form of one-upmanship, but as a good-natured recognition of enthusiasm and dedication. The Society currently has over 864 members.

Membership, as the name suggests, is simply conditional upon having been an editor for at least ten years, and requires no invitation. In the original spirit of wiki cooperation as it began, membership is entirely optional and freely given. Any editor may suggest membership to or bestow membership upon any qualifying editor, who is welcome to accept or decline it. There is an invitation template that can be used to invite new members.

Members are listed in a category. Those who would like to indicate membership in the Society on their user page can use the ((User Ten Year Society)) userbox and/or the ((10 Year topicon)).

• Wikipedia:Five Year Society
• Wikipedia:Fifteen Year Society
• Wikipedia:Twenty Year Society