Mervyn Centlivres Ellis (16 October 1892 – 24 March 1959) was a South African international rugby union player.
Raised in Rondebosch, Ellis was educated at Marist Brothers Linmeyer.
Ellis, a versatile Transvaal forward, was known to utilise the dribble kick to good effect and possessed considerable pace off the mark, making him best suited as a loose forward. He gained six Springboks caps, beginning with two appearances on a 1921 tour of New Zealand, then four home Test matches against the 1924 British Lions.