Harold Reginald ("Reg") Armstrong[1] (1 September 1928 – 24 November 1979[2]) was an Irish professional Grand Prix motorcycle road racer.

He competed in Grand Prix Motorcycle World Championships and at the Isle of Man TT, usually placing highly.

Reg Armstrong was born in a nursing home at 37 Lower Leeson Street, Dublin,[citation needed] on September 1, 1928.

Armstrong did not have a privileged background but, his father started a successful motor factoring business in Dublin and supported his early motorcycle racing as much as he could.

A cousin, Harry Lindsay taught him to ride during the Emergency (as World War II was referred to in the Republic of Ireland) and both rode 16H Nortons.

He borrowed a 500 cc engine and put it into his Norton, and entered the 1947 Senior Manx race without success.

In the 1948 Skerries 100 he rode a Tom Arter AJS 7R to success, boosting his confidence enough to purchase a Triumph GP, with the help of his cousin Harry.

He became a good clay pigeon shooter, representing Ireland in the 1978 World Championships, held in Korea.