Walter Weedon Grossmith (9 June 1854 – 14 June 1919), better known as Weedon Grossmith, was an English writer, painter, actor, and playwright best known as co-author of The Diary of a Nobody (1892) with his brother, music hall comedian and Gilbert and Sullivan star George Grossmith. Weedon Grossmith also illustrated The Diary of a Nobody to much acclaim.