Nathaniel Curtis (born 29 December 1990) is a British actor. He is best known for his role as Ash Mukherjee in the Channel 4 drama It's a Sin (2021).

Curtis grew up just outside Bournemouth^[1] to an English mother and Indian father.^[2][3] He completed his acting degree at East 15 Acting School in Loughton, Essex in 2014.^[4][5]

After graduating, Curtis went five years without an acting job.^[6] One of his first acting roles was as Romeo in Romeo and Juliet for Fuller's Brewery's Shakespeare in the Garden theatre series, run by Open Bar Theatre^[7] in 2019^[8][9] which was nominated for an Offie award.^[10] He later played Ferdinand, Alonso, and Trinculo in the following year's production of The Tempest.

Curtis played Ash Mukherjee in It's a Sin,^[11][12] the Award Winning British television series developed by Russell T Davies that premiered in early 2021 on Channel 4 in the UK^[13][14] and on HBO Max in the United States.^[15] Curtis was named the winner on the 2021 Great British Bake Off Christmas Special after competing in baking challenges with other members of the cast of It's a Sin.^[16]

In the summer of 2022, Curtis returned to the stage to play the title role in Britannicus at the Lyric Theatre, Hammersmith.^[17][18]

He played the role of Brian^[19] in The Witcher: Blood Origin,^[20] a Netflix miniseries that serves as a prequel to The Witcher and was released on 25 December 2022.^[21][22][23]

Following his performance in the world premiere of Andrew Stein's play, Disruption, at the Park Theatre in London^[24] in the summer of 2023, Curtis later joined the cast of 2:22 A Ghost Story. His involvement in this production was marked by a UK tour, which took place throughout the autumn season.

In December 2023, he had a brief appearance as Sir Isaac Newton in the Doctor Who 60th anniversary special "Wild Blue Yonder".^[25]

Curtis identifies as queer^[26][27] and stands 6'5" tall.^[28] He has an older sister.^[29]