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Henry Howley (1775?-1803), was an Irish insurgent.
Howley was a Protestant, and worked as a carpenter in his native place, Roscrea, co. Tipperary. He took part in the rebellion of 1798 and in Robert Emmet's insurrection. While engaged in the latter plot he was the ostensible proprietor of the store in Thomas Street, and to him was assigned the task of bringing up the coaches by means of which Emmet designed to effect his entrance into Dublin Castle.
While engaged, however, in carrying out this part of the programme, and as he was passing along Bridgefoot Street, Howley stopped to interfere in a common street brawl, which ended with him shooting Colonel Lyde Brown. Compelled thereupon to consult his own safety, Howley left the coaches to their fate and fled. To this untoward accident Emmet chiefly ascribed the failure of his plot. Howley's hiding-place was subsequently betrayed by a fellow-workman, Anthony Finnerty, to Major Sirr. In the scuffle to arrest him Howley shot one of the major's men, and escaped into a hayloft in Pool Street, but was soon captured. He was condemned to death by special commission on 27 September 1803 and confessed to having killed Colonel Brown.
Dictionary of National Biography. London: Smith, Elder & Co. 1885–1900..