Gleb may refer to:
- Gleb, Slavic name of Norse origin
- Gleb Svyatoslavich, the ruler of Tmutarakan (XIst. century)
- Gleb of Kiev (died 1171), Prince of Kursk (1147), Kaniv (1149), Pereyaslavl (1155–1169), and Grand Prince of Kiev (1169–1171)
- Gleb Svyatoslavich (Prince of Chernigov) (1168–1215), Rus' prince (a member of the Rurik dynasty)
- Narimantas (1299–1348)
- Gleb Shishmaryov (1781–1835), rear admiral of the Imperial Russian Navy
- Gleb Uspensky (1843–1902), Russian writer
- Gleb Kotelnikov (1872–1944), the Russian-Soviet inventor of the knapsack parachute
- Gleb Krzhizhanovsky (1872–1959), Soviet economist and a state figure
- Gleb Verhovskiy (1888–1935), Russian Orthodox converted to Catholicism of Byzantine Rite
- Gleb W. Derujinsky (1888–1975), Russian-American sculptor
- Gleb Struve (1898–1985), Russian poet and literary historian
- Gleb Wataghin (1899–1986), Ukrainian-Italian experimental physicist and scientific leader
- Gleb Botkin (1900–1969), the son of Dr. Eugene Botkin, the court physician who was murdered at Ekaterinburg by the Bolsheviks in 1918
- Gleb Krotkov (1901–1968), Canadian academic and plant physiologist
- Gleb Lozino-Lozinskiy (1909–2001), Russian engineer, General Director and General Designer of the JSC NPO Molniya
- Gleb Strizhenov (1923–1985), Soviet actor, Honoured Artist of the RSFSR
- Gleb Axelrod (1923–2003), Russian pianist
- Gleb Yakunin (born 1934), Russian priest and dissident who fought for the freedom of conscience in the Soviet Union
- Gleb Panfilov (born 1934), Russian film director noted for a string of mostly historical films starring his wife, Inna Churikova
- Gleb Pavlovsky (born 1951), pro-Kremlin political scientist
- Gleb Vladimirovich Nosovsky (born 1958), Russian mathematician
- Gleb Panfyorov (born 1970), retired Russian professional footballer
- Gleb Shulpyakov (born 1971), Russian poet, essayist, novelist and translator
- Gleb Pisarevskiy (born 1976), Russian weightlifter and Olympic medallist
- Gleb Galperin (born 1985), Russian diver