Danno O'Mahony (9 September 1912 – 3 November 1950) was an Irish professional wrestler who enjoyed a brief but meteoric rise to massive popularity in the mid-1930s following a successful introduction to the Boston regional wrestling scene.

In 1933, while serving in the Irish Defence Forces, O'Mahony distinguished himself as an athlete, setting military records for the hammer throw and the 56-lb.

Bowser was hoping to create a new Irish star for the ethnic marketplace in New York and New England, in the tradition of 19th-century champion William Muldoon.

He signed O'Mahony to a $100,000 contract, and promoted him as the strongest man in the world, and the Irish champion who was looking for international competition.

After several years of professional conflict, Bowser and the other major rival promoters were working together by late 1933, with most of the territories agreeing to support Londos as their main world champion.

As wrestling's leading attraction, Londos had an enviable deal with the promotional cadre that included a $50,000 payoff were he to lose the championship.

Besides O'Mahony, various wrestlers including Chief Little Wolf, Orville Brown, Lou Thesz, Bronko Nagurski, Daniel Boone Savage and Everett Marshall were all waiting to get the call.

After facing a string of top names, such as Man Mountain Dean, Gus Sonnenberg and Henri DeGlane, the long-expected O'Mahony-Londos match was announced.

On 27 June 1935, at Boston's Fenway Park, Danno beat Londos to win the New York State Athletic Commission World Heavyweight Championship, which was also recognized by the National Wrestling Association.

[4][5] He went on to win the American Wrestling Association World Heavyweight Championship, defeating Ed Don George at Boston's Braves Field on 30 July 1935.

However, O'Mahony's title reign was turning into less than the roaring success promoter Bowser had hoped for, with the young champion being booed and attendance for many of his matches slumping.

To quiet Sandow, Bowser responded by offering a match with two of his other wrestlers: Ed "Strangler" Lewis or Jim Browning, both of whom had feared reputations as "shooters."

Informed that an opponent planned to "hook" and injure O'Mahony in their match, the champion and his manager simply left the arena.

On 2 March 1936, O'Mahony lost his National Wrestling Association World Heavyweight Championship to Dick Shikat at New York's Madison Square Garden.

In the aftermath of this, the behind-the-scenes negotiations were exposed in a court case, no fewer than five wrestlers were being billed as champions, and the pseudo-sport's popularity fell.

Before one of his matches, the Boston Globe printed a headline reading "Expect Danno to Lose His Crown at Garden Tonight."

By 1937, O'Mahony was starting to suffer draws or losses, including losing regional title matches against Everett Scott and Lou Thesz.