Alexander or Alex Ellis may refer to:

• Alexander John Ellis (1814–1890), English mathematician and philologist
• Boo Ellis (Alexander Ellis, 1936–2010), American basketball player
• Alexander Ellis III (born 1949), American businessman
• Sir Alex Ellis (diplomat) (born 1967), British diplomat
• Alex Ellis (racing driver) (born 1991), Canadian racing driver
• Alex Ellis (American football) (born 1993), American football tight end
• Alex Ellis (rugby union) (born 1995), Canadian rugby union player