Gemma Merna (born 6 February 1984) is a former English actress, model and yoga teacher. She is best known for portraying the role of Carmel McQueen in the Channel 4 soap opera Hollyoaks from 2006 to 2014. In 2008 Merna appeared on the game show All Star Family Fortunes in a Hollyoaks v Emmerdale special. In February 2013, she appeared on All Star Family Fortunes playing against gardener, garden designer and television personality Diarmuid Gavin. In 2009, Merna appeared in the spin-off show Hollyoaks Later as Carmel. She also appeared in an episode of the game show Hole in the Wall. In 2011, she appeared in the documentaries 50 Greatest Wedding Shockers and Hollyoaks Best Bits. In 2013 and 2014, Merna appeared as a panelist in an episode of Big Brother's Bit On The Side.
In January 2014, she was a contestant on the ITV diving show Splash!, fronted by Tom Daley, she was the first contestant to be eliminated from the show in Heat One. On 24 August 2014, it was announced that Merna had decided to leave Hollyoaks and would leave in November 2014 in one of Hollyoaks' biggest stunts. Jennifer Metcalfe – who plays Merna's on-screen sister Mercedes McQueen – announced her decision to leave the soap opera a few days after Merna's announcement. The character was killed off in an explosive train accident on 12 November 2014, with cast members and television critics praising Merna's performance in her final scenes. On 8 September 2014, Merna appeared on the panel show Virtually Famous, presented by Glee actor Kevin McHale. On 25 October 2014, Merna appeared on a special celebrity episode of The Chase. In 2017 Merna appeared in an episode in TV show Doctors. She also joined former TV mum Nicole Barber-Lane as teammates on the 28 October 2017 "Soaps" episode of Pointless Celebrities.