Harry William Holmes OBE, (1896 in London–8 November 1986 in London) was a board member and honorary president of the World Esperanto Association (Universala Esperanto-Asocio, UEA).
He and his wife Nora Holmes (1902–14 May 1993) were for two decades among the most active members of the London Esperanto Club; he served as its president from 1933 until 1952.
In this post, as in his editorship of Komuna kantlibro, a book of popular songs, his wife Nora assisted and collaborated with him to such a degree that he often spoke in terms of "our presidency."
In 1956 he was elected vice-president of the World Esperanto Association, a post he retained until 1964.
At the 49th World Esperanto Congress, in recognition of his tireless labour and meritorious service to the Association, he was unanimously elected as honorary president of the UEA, a position he occupied for a decade.