William Hamilton Beattie (10 December 1842 – 29 November 1898) was a Scottish architect specialising in hotel design in the late 19th century.
He was the eldest son of George Beattie (1810-1872) an architect/builder in Edinburgh and older brother to George Lennox Beattie (1862-1932), who also became an architect and continued the practise after William Hamilton's death.
He was christened simply William Beattie and did not adopt the name Hamilton (a family name) until 1877, by which time his career was taking off and a three part name better suited his aspirations to individuality.