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Seif is the family name of the following people:
- Abd El Aziz Seif-Eldeen (* 1949), Egyptian Air Force Commander
- Ahmad Seif el-Islam (1951–2014), Egyptian lawyer and human rights activist
- Detlef Seif (* 1962), German politician (CDU)
- Karl-Winfried Seif (* 1943), German politician (CDU)
- Leonhard Seif (1866–1949), German neurologist, educational advisor and individual psychologist
- Linus Seif (1727–1800), South German painter
- Mona Seif (* 1986), Egyptian human rights activist
- Riad Seif (* 1946), Syrian entrepreneur and dissident
- Sanaa Seif (* 1993), Egyptian political activist
- Silke Seif (* 1972), German politician (CDU)
- Theodor Seif (1894–1939), Austrian scholar of Islam
- Werner Seif (* 1955), Austrian civil servant
Seif is the name for:
- Seif (dune) (Arabic = sword), longitudinal dunes, which are particularly narrow and sharp-edged
Seif is also an Arabic battle name
- Abu Sajaf (Arabic = swordsman) is an Islamist militant underground organization
- Saif al-Islam al-Gaddafi (Arabic = sword of Islam), the second eldest son of Muammar al-Gaddafi
- Saif al-Adel (Arabic = sword of justice) is an Islamic extremist of al-Qaeda
- Abu Seif Al Sudani , a suspected terrorist
- Seif el-Din el-Zoubi , from the Democratic List of Nazareth
See also: