Reginald Armstrong (1 September 1928 – November 1979) was an Irish professional Grand Prix motorcycle road racer. He was born in Liverpool, grew up in Dublin and raced for the AJS, Velocette, Norton, NSU, and Gilera factory racing teams. He then became team manager for Honda's racing team in 1962 and 1963, and they won five world championships in that time. He was also in his lifetime a sales agent for NSU, Honda, and Opel. He competed in Grand Prix Motorcycle World Championships and at the Isle of Man TT, usually placing highly. He died in a road accident in 1979.

Born in Liverpool, Armstrong's family returned to Dublin within a few years of his birth. 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. Both joined the Irish Defence Forces, with the petrol ration a prime consideration.

In 1946, Armstrong rode a pre-war Norton Manx at the Bangor Castle races in Northern Ireland. His was fifth in his second race, a handicap event, the Mid-Antrim 150, and then failed to finish at the Skerries 100. He put in an entry for the 1946 Manx but was refused as his 18th birthday was on the same day as the race. He borrowed a 500 cc engine and put it into his Norton, and entered the 1947 Senior Manx race without success.

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