Welby may refer to:
Entertainment Marcus Welby, M.D., a 1970s television series in the United States
Places Welby, New South Wales, Australia, a town Welby, Lincolnshire, United Kingdom, a village Welby, Colorado, United States, a census-designated place
People Welby baronets, created in 1801 Sir Alfred Welby, English politician Alfredo Welby, Italian professional footballer Amelia Welby (1819–1852), American poet Sir Christopher Welby-Everard, British Army officer Euphemia Welby, Women's Royal Naval Service officer Henry Welby (died 1636), English recluse Justin Welby (born 1956), Archbishop of Canterbury 2013–2025 Norrie May-Welby, Scottish-Australian transgender social activist Piergiorgio Welby, subject of a right-to-die debate in Italy Reginald Welby, 1st Baron Welby, British peer Siân Welby, English television presenter and radio host Thom Welby, American politician and broadcaster. Thomas Welby, English missionary Victoria, Lady Welby, self-educated English philosopher of language Welby Ings (born 1956), New Zealand film director, activist and academic