The Royal National Rose Society (RNRS) (1876–2017) was a specialist horticultural organization in the United Kingdom dedicated to the cultivation and appreciation of roses. Founded in 1876 as the "National Rose Society", it was the world's oldest plant society. It was a membership organisation, with members drawn from professional and amateur gardeners and horticultural businesses. Originally based in London, the rose society moved its headquarters to Chiswell Green, near St Albans, Hertfordshire in 1959, where it created the Royal National Rose Society Gardens. In 1965, the society changed its name to the "Royal National Rose Society" (RNRS). At the height of its popularity, the RNRS had 100,000 members and its gardens contained 30,000 rose shrubs. The organisation was dissolved in May, 2017 and the gardens were closed permanently.

A rose show is a horticultural exhibition focusing exclusively on roses.