Alia or Aleah is a surname and a feminine given name, in both cases variations of the name Aaliyah. Of Arabic origin, the name means "high" or "exalted". Notable people with these names include:

• Gjergj Elez Alia, a legendary hero of poetry and literature in Bosnia and Albania
• Giuseppe Alia, murderer of Father Leo Heinrichs (1867–1908)
• Malek Aït Alia (born 1977), Algerian footballer
• Ramiz Alia (1925–2011), second and last Communist leader of Albania (1985–1991) and head of state (1982–1992)

• Alia Ali, American visual artist of Bosnian and Yemeni heritage
• Alia Atkinson (born 1988), Jamaican swimmer and five-time Olympian
• Alia Bano, British playwright of Pashtun origin
• Alia Bhatt (born 1993), British actress
• Alia Ghanem, birth name of Hamida al-Attas (born 1934), mother of Osama bin Laden
• Alia al-Hussein (1948–1977), Queen of Jordan
• Princess Alia bint Al Hussein (born 1956), eldest child of King Hussein of Jordan
• Alia Mamdouh (born 1944), Iraqi novelist, author and journalist
• Alia Ouabdelsselam (born 1978), French ice dancer
• Alia Penner (born 1985/1986), American pop artist
• Alia Humaid Al Qassimi, Emirati surgeon
• Alia Sabur (born 1989), American materials scientist and world's youngest professor
• Alia Shawkat (born 1989), American actress
• Princess Alia Tabba (born 1964), Jordanian princess

• Aleah Chapin (born 1986), American painter
• Aleah Stanbridge (1976–2016), South African singer-songwriter, former singer of death/doom metal band Trees of Eternity.

• Alia Atreides, in the Dune universe created by Frank Herbert
• Alia, in the Mega Man X video game series

• Alija, a surname and a given name
• Aliya, an Arabic given name that is the feminine form of Ali, meaning "high" and "exalted" (also spelled Aaliyah or Alia)
• Aliah