Sebastian Stegmann (born 12 April 1989 in Isleworth) is a rugby union player for Ealing Trailfinders in the RFU Championship.

He attended Cranleigh School as a youngster and during his time in Harlequins academy, he spent several games playing for Esher RFC.

On 25 February 2013, Sebastian Stegmann would leave Harlequins to join London Welsh on a two-year contract for the 2013/14 season.

[2] On 10 April 2015, Stegmann signs for Yorkshire Carnegie on a two-year deal in the RFU Championship from the 2015-16 season.

[3] On 25 May 2017, Stegmann signed for Championship rivals Ealing Trailfinders from the 2017-18 season.