Olesia (Ukrainian and Russian: Олеся), may also be spelt Olessia or Olesya, is a feminine given name.
Olesia is a Slavonic name that derives from a word "lyess" (Ukrainian "ліс", Russian "лес" - forest) and means "a girl from the forest", "a girl living in the forest". A different version of the origin of the name states that Olesia is a variant of the name Alexandra, and thus acquires the meaning of "protector". The names Alesya and Lesya can be considered variants of Olesia.
Notable people with the name include:
- Olesya Aliyeva (b. 1977), Russian alpine skier
- Olesya Babushkina (b. 1989), Belarusian gymnast
- Olesya Bakunova (b. 1980), Belarusian sprint canoer
- Olesya Barel (b. 1960), Russian basketball player
- Olesya Belugina (b. 1984), Russian gymnast
- Olesya Chumakova (b. 1981), Russian middle-distance runner
- Olesya Dudnik (b. 1974), Ukrainian gymnast and coach
- Olesya Forsheva (b. 1979), Russian athlete
- Olesya Hudyma (b. 1980), Ukrainian artist, poet and journalist
- Olesya Kurochkina (b. 1983), Russian football player
- Olesya Mashina (b. 1987), Russian footballer
- Olesya Nazarenko (born 1976), amateur wrestler, judoka and sambo player from Turkmenistan
- Olesya Nurgalieva (b. 1976), Russian ultramarathon runner
- Olesya Povh (b. 1987), Ukrainian sprinter
- Olesya Rostovskaya (b. 1975), Russian composer, theremin player, carillonneur, organist, Russian zvon bell-ringer
- Olesya Rulin (b. 1986), Russian-American actress
- Olesya Stefanko (b. 1988), Ukrainian beauty pageant winner
- Olesya Syreva (b. 1983), Russian athlete
- Olesya Velichko (b. 1981), Russian modern pentathlete
- Olesya Vladykina (b. 1988), Russian Paralympic swimmer
- Olesya Truntaeva (b. 1980), Russian footballer
- Olesya Zabara (b. 1982), Russian triple jumper
- Olesya Zamula (b. 1984), Azerbaijani wrestler
- Olesya Zykina (b. 1980), Russian athlete