Apollo 18

Apollo 18 may refer to:
 * One of the canceled Apollo missions of the American Apollo lunar program of the 1960s and 1970s
 * The officially unnumbered Apollo spacecraft used in the 1975 Apollo–Soyuz Test Project
 * The fictional Apollo 18 mission in James Michener's 1982 novel Space
 * The fictional Apollo 18 mission in the 2024 Constellation TV series on Apple TV+
 * Apollo 18: Mission to the Moon, a 1988 video game by Accolade
 * Apollo 18 (album), a 1992 album by They Might Be Giants
 * Apollo 18 (band), a Korean indie rock trio, formed in 2008
 * Apollo 18 (film), a 2011 horror film directed by Gonzalo López-Gallego