Leiber may refer to:
- Surname
- Fridolin Leiber (1853-1912), German painter
- Fritz Leiber (1910-1992), American writer of fantasy, horror and science fiction.
- Fritz Leiber, Sr. (1882-1949), American actor
- Hank Leiber (1911-1983), American baseball player
- Jerry Leiber (1933-2011), American songwriter and record producer
- Judith Leiber (born 1921), American fashion designer
- Justin Leiber (born 1938), American philosopher and science fiction writer
- Robert Leiber (1887-1967), German Roman Catholic priest
- Other
- Nickname for members of the Royal Bavarian Infantry Lifeguards Regiment (Leibregiment)