Maundy (from Latin Mandatum), or Washing of the Feet, is a religious rite observed as an ordinance by several Christian denominations. John 13:1–17 mentions Jesus performing this act. Specifically, in verses 13:14–17, He instructs them, 14 "If I then, your Lord and Teacher, have washed your feet, you also ought to wash one another’s feet." 15 "For I have given you an example, that you should do as I have done to you." 16 "Most assuredly, I say to you, a servant is not greater than his master; nor is he who is sent greater than he who sent him." 17 "If you know these things, blessed are you if you do them." As such, many denominations observe the washing of the feet on Maundy Thursday of Holy Week. Moreover, for some denominations, foot-washing was an example, a pattern. Many groups throughout Church history and many modern denominations have practiced foot washing as a church ordinance.

The derivation of the word is Maundy has at least two possibilities for the origin. 1) Through Middle English and Old French mandé, from Latin mandatum. 2) From the Latin mendicare, Old French mendier, and English maund, which means “to beg” (verb) or a “small basket” (noun) held out by maunders (beggars) as they maunded (begged).