Mannlicher may refer to:
- Ferdinand Mannlicher (1848–1904), a Bohemian-German/Austrian weapon designer
- various guns bearing his name:
- Mannlicher-Schönauer rifle
- Steyr Mannlicher M1894 pistol
- Steyr Mannlicher M1901 pistol
- Mannlicher-Carcano rifle
- Steyr-Mannlicher M1895 rifle
- Steyr Mannlicher, a famous weapon manufacturer