Michael O'Hanrahan (1877 - May 4, 1916) was an Irish rebel who took an active role in the Easter Rising. He was second in command of Dublin's 3rd battalion under Commandant Thomas MacDonagh, though his role as such was usurped by the last minute addition of John MacBride to the battalion (as, one could argue, was MacDonagh's). He fought at Jacob's Biscuit Factory, though the battalion saw little action throughout Easter week, as the British Army largely circumvented their position. O'Hanrahan was executed by firing squad on May 4, 1916.