Michael E. "Mike" McGloin (c. 1862 – March 9, 1883) was a 19th-century criminal and leader of the Whyos, a New York City street gang.
Continuing the ruthless tactics of his predecessors "Dandy" Jim Dolan, Piker Ryan and others of the previous decade, McGloin terrorized New York's Westside, particularly Hell's Kitchen throughout the late 1870s.
On the night of December 29, 1881, four members of the Whyos (presumably including McGloin) entered a local Hell's Kitchen tavern owned by Louis Hanier.
Asking the men to leave, there was no further incident until around midnight when Hanier closed the bar and went upstairs to bed.
Byrnes, accompanied by Captain Williams and six other officers, raided the Whyos headquarters, arresting gang members Thomas Moran, Frederick Banfield and Robert Morrissey on January 31, 1882.