Advice or advise: which is correct?

Correct
advice (noun) / advise (verb)
Avoid
advise (as the noun: "some advise")
Avoid
advice (as the verb: "I advice you")
Summary

Correct: advice (noun) / advise (verb) — Avoid: advise (as the noun: "some advise") / advice (as the verb: "I advice you"). Advice = a recommendation about what to do (noun); advise = to recommend or give advice (verb).

Part of speech
noun / verb
Source
Oxford

Why

Oxford: advice (with c, pronounced like ice) is the noun; advise (with s, pronounced like eyes) is the verb — the same noun/verb pattern as device/devise and, in British English, practice/practise.

Examples

  • Thanks for the advice.
  • I would advise you to wait a week.
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Checked against
Merriam-Webster / Oxford
Spelling authority
Merriam-Webster · Oxford English Dictionary / Oxford spelling · SCOWL
Commonly confused and non-standard forms
64
Dictionary
Hunspell en_US / en_GB / en_AU / en_CA · Dictionary license: MIT AND BSD (SCOWL combined licence)