Beauchamp Bagenal Harvey (died 28 June 1798) was a barrister and a commander of the United Irishmen in the Battle of New Ross during the 1798 Rebellion.
From June 1792 he was a member of the Dublin Society of United Irishmen, founded by James Napper Tandy and Archibald Hamilton Rowan.
[2] Just before the outbreak of the 1798 Rebellion Harvey was arrested at his home on 26 May 1798 at 11.00 p.m. A rebel colonel, Anthony Perry, divulged the information after giving in to torture by Crown forces.
Confident that a treaty would be negotiated on the rebels' behalf by Lord Kingsborough, the captured loyalist commander of the North Cork Militia, he retired to his family home at Bargy Castle.
Shortly afterwards he and John Henry Colclough, dressed as peasants, travelled to a cave on the Greater Saltee Island from whence they planned to escape to republican France.
[citation needed] In his memoirs Jonah Barrington listed Harvey as a rebel supporter in April 1798, before the rebellion started.