Johnny Condon was the son of former professional boxer Pat Condon, who fought as a welterweight between 1878 and 1889, winning just three of his 14 contests. Johnny started boxing in novice events in 1906-07 and in 1908 lost on points in the Olympic bantamweight final, beaten by Harry Thomas. Condon beat the Canadian Turley to win the ABA bantamweight title in 1909, and shortly afterwards turned professional. Condon made his début at the National Sporting Club, London, and enjoyed a points win over Bill Ledbury, who later won the British and European flyweight title. Condon had only one championship bout, when he fought the defending champion Digger Stanley for the British and European bantamweight title in December 1910, losing on points. Condon had 31 professional bouts, winning 15 and drawing five. He saw service in France during World War I, and was a staunch member of the United Irish League. Condon died one week before his 30th birthday from pneumonia, after an attack of influenza.