– Zakir Naik (born 1965)
– Albert Odulele (born 1964)
– T.L. Osborn (1923–2013)
– Joel Osteen (born 1963)
– John Osteen (1921–1999)
– Paul Osteen (born 1955)
– Chris Oyakhilome (born 1963)
– Luis Palau (1934–2021)
Who is the leader of the Protestant Church?
Martin Luther, often called the father of Protestantism, fundamentally changed the Christian world through his force of will and new ideas. He tried passionately to reform the Catholic Church.