Both are in dictionaries. I've heard people insist "requester" is correct for a person who requests something, and that "requestor" is wrong there, leaving me to wonder how it is used. Requestor happens to be marked as an error in my browser's spellchecker.

COCA for requester/requestor indicates that requester is used for people and requestor is used in technical senses like a part of a program. A google ngram for requester/requestor shows that requester is also a bit more common.

Some online discussions suggest requestor may have a meaning in law or be more common there, but I can't find that.

What's the difference in usage? Should requester be used for people, or is it more nuanced than that?

Note: These related questions discuss "creator" and "updater" and discuss -er and -or endings overall.


With one exception 1 I don't think there is a nuanced difference here but rather multiple formations of the same concept. As you noted, requester is more common than requestor.

This explanation about choosing -er or -or includes the following:

4. -or is used when the base word ends in -ate, -ct, -it : calculate/calculator create/creator investigate/investigator contract/contractor reflect/reflector conduct/conductor visit/visitor exhibit/exhibitor edit/editor

1 In programming languages that have the concept of an interface you sometimes see the "-or" form, so follow the conventions of whatever domain you're writing in.

  • 4
    came here for the same reason- database tables are requestor named, and the UI of the application uses the term requester – David Mann Jun 30 '14 at 16:57
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    The spelling "requestor" should only be used by a programmor. :) – GEdgar Jun 11 '15 at 21:13
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    @GEdgar Exactly! Just like our license to the term "referer". – zxq9 Nov 21 '17 at 10:13
  • Perhaps the "requestor" variant comes from a similarity with "contributor." But I think @GEdgar has a point. – Josiah Yoder Jul 31 '19 at 14:14
  • The link in the answer is dead and not copy-paste googleable. – Josiah Yoder Jul 31 '19 at 14:16

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