Segre is a surname. Notable people with the surname include:

• Beniamino Segre (1903–1977), Italian geometer
• Corrado Segre (1863–1924), Italian geometer
• Emilio G. Segrè (1905–1989), Italian American physicist
• Luigi Segre (1919–1963), Italian automobile designer

• Calbiga
• Calbiga, Samar
• Calbria
• Calc.
• Calcaerous sponges
• Calcahualco
• Calcaneal tendon
• Calcaneus
• Calcarea
• Calcareous grassland
• Calcareous sponge
• CAL Cargo Air Lines
• Calcarius
• Calcarius lapponicus
• Calcarius mccownii
• Calcarius ornatus
• Calcarius pictus
• Calcasieu County
• Calcasieu Parish
• Calcasieu Parish, LA
• Calcasieu Parish, Louisiana
• Calcasieu River
• Calcentine
• Calc.exe
• Calcflinta