Anthony Michael Mortimer (born 21 October 1970) is a British singer, songwriter and record producer from London.

He is a former member of the boy band East 17, who were originally active from 1991 to 1997 and sold over 20 million records worldwide.

He turned to songwriting[clarification needed] when the group disbanded in 1997, due to negative media coverage after fellow member Brian Harvey said that he had taken twelve ecstasy tablets in one night.

In December 2019, Mortimer released a re-recorded version of "Stay Another Day" with the Waltham Forest Youth Choir, to raise money for mental health charity CALM.

The award-winning lyrics of his song, "Stay Another Day", were inspired by the death of his brother, Ollie, by suicide.