The incident happened at Sloane Square station just before 10.30am today (June 28).
British Transport Police confirmed the man died of “serious, self-inflicted” injuries at the scene.
A spokesperson for the force also added that the incident involved a knife.
The Daily Mail reported he stabbed himself in front of commuters, prompting a panic at the station, with some people fleeing the scene.
The incident is not being treated as suspicious.
A spokesperson for British Transport Police said: “Officers were called to Sloane Square Underground station at 10.26am on 28 June following reports that a man had sustained serious, self-inflicted injuries.
“Paramedics also attended however despite their best efforts the man has been pronounced dead at the scene.
“The incident is not being treated as suspicious.”
