Benjamin Warren (7 May 1879 – 15 January 1917) was an England international footballer who played as a half-back for Derby County and Chelsea.

Playing at half-back, though he could also fill in at inside forward, Warren was known for his hard but fair tackling, and for his consistent performances.

He retained his place in the England side, but once again the closest he came to success with a club was in the FA Cup, playing in every game for Chelsea en route to the semi-finals in 1911, where they lost to Newcastle United.

A knee injury sustained while playing for Chelsea in a 4–1 win over Clapton Orient ended Warren's career and led to a decline in his mental health.

Faced with a long lay-off, and with a young family to support in the days before footballers were well-paid, Warren suffered a mental breakdown and began to be plagued by hallucinations and delusions he was being poisoned; by 1912 he had been admitted to a lunatic asylum in Mickleover, Derbyshire.