Apologize is the standard American English spelling. Apologise is the standard British English spelling.

What is correct apologies or apologize?

An apology is an expression of sorrow, regret, or remorse. To apologize, you might send the wronged party a letter if you don't prefer to apologize in person. ... My apologies is a way to say you're sorry about something. My apology is a reference to a previous apology you made.

Is it Apologise or apologize in UK?

Apologise is the British English spelling of the verb apologize. So if you need to say you're sorry for something you did in London, you should apologise.