"Who are the bombers?" the budget airline's controversial chief executive said while discussing airport security in the interview with the Times newspaper.
"They are going to be single males travelling on their own... If you are travelling with a family of kids, on you go; the chances you are going to blow them all up is zero."
"You can't say stuff, because it's racism, but it will generally be males of a Muslim persuasion. Thirty years ago it was the Irish."
A spokesman from the Muslim council of Britain accused O'Leary of "Islamophobia".
O'Leary was "encouraging racism", Labour MP Khalid Mahmood told the newspaper.
"In Germany this week a white person killed eight people. Should we profile white people to see if they're being fascists?"
The Ryanair CEO is known for his controversial views and has floated proposals to charge fliers to use the toilet during Ryanair flights and a "fat tax" on obese passengers.
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