A peti­tion is a request to do some­thing, most com­mon­ly addressed to a gov­ern­ment offi­cial or pub­lic enti­ty. Peti­tions to a deity are a form of prayer called sup­pli­ca­tion.

In the col­lo­qui­al sense, a peti­tion is a doc­u­ment addressed to some offi­cial and signed by numer­ous indi­vid­u­als. A peti­tion may be oral rather than writ­ten, or may be trans­mit­ted via the Inter­net.