Alexandre is a French and Portuguese surname. Notable people with the surname include:

• Aaron Alexandre (c.1765–1850), German–French–English chess player and writer
• Guy Alexandre (1945–2014), Haitian diplomat
• Jean Alexandre (born 1986), Haitian footballer
• Jean C-Alexandre (born 1942), Haitian doctor and diplomat
• Kathryn Alexandre (born 1990), Canadian actress

• Altenrhein SG
• Altenstein
• Altenstein (disambiguation)
• Alten, Steve
• Altenwalde
• Altenweddingen
• ALT (EP)
• Alteran language
• Alteran script
• Altera Quartus
• Alterations (band)
• Alterations in the pronunciation of English ⟨th⟩
• ALTER BRIDGE
• Alter Bridge Recordings
• Alter, David
• Altered Beast 2
• Altered Carbon (TV series)
• Altered dominant chord
• Altered (drag racing)
• Altered State (Sev Statik album)
• Altered State (Stu Dent album)
• Alteref UR
• Alter/Ego
• AlterEgo
• Alter Ego (2017)