Khuda or Khoda (Persian: خدا‎) is the Persian word for "Lord" or "(monotheistic) God", formerly used for Ahura Mazda, and today for God in Islam by Persian speakers, and as a loanword in Urdu and Hindi. The term is originally from a Middle Persian honorific.

The term derives from Middle Iranian xvatay, xwadag meaning "lord", "ruler", "master" (written as Parthian kwdy, Middle Persian kwdy, Sogdian kwdy, etc.). It is the Middle Iranian reflex of Avestan x^va-dhata- "self-defined; autocrat", an epithet of Ahura Mazda. The Pashto term Xwdāi (خدای) is a New Iranian cognate.

Prosaic usage is found for example in the Sassanid title katak-xvatay to denote the head of a clan or extended household, or in the title of the 6th century Khwaday Namag "Book of lords", from which the tales of Kayanian kings as found in the Shahnameh ("Book of kings") derive.

Semi-religious usage appears for example in the epithet zaman-i derang xvatay "time of the long dominion", as found in the Menog-i Khirad. The fourth and eighty-sixth entry of the Pazand prayer titled Sad-o-yak nam-i-khoda ("101 Names of God"), reading, Harvesp-Khoda "Lord of All" and Khudawand "Lord of the Universe", respectively, are compounds involving Khuda. Application of khuda as "the Lord" (Ahura Mazda) is represented in the first entry in the medieval Frahang-i Pahlavig.