Karasu

The Balkans

• A former name of the Struma River (Struma Karasu) in Bulgaria and Thrace, northern Greece
• A former name of the Mesta River (Mesta Karasu) in Bulgaria and northern Greece, forming the border between Greek Macedonia and Thrace
• A former name of the Haliacmon (İnce Karasu) in western Macedonia, northern Greece
• Karasu (Istanbul), a river in the greater Istanbul area of Turkey

Central Asia

• Qarasu River, a small river in northeast Iran feeding into the southeast corner of the Caspian Sea
• Kara-Suu (Aksy), a right tributary of the river Naryn in Aksy District, Kyrgyzstan
• Kara-Suu (Kara-Köl), a left tributary of the river Naryn near Kara-Köl, Kyrgyzstan
• Karasu, name of the last stretch of river Shiderti, Kazakhstan
• Karasu (Koybagar), a river in Kostanay Region, Kazakhstan
• Karasu (Karasor), a river in Karaganda Region, Kazakhstan

Japan

• Karasu River (Gunma) in Gunma Prefecture, Japan

Turkey

• Karasu (Euphrates), the western of the two major sources of the Euphrates in Eastern Anatolia
• Karasu (Hatay), a tributary of the Orontes River (formerly of Lake Amik) in Hatay Province, southeastern Turkey, bordering Syria
• A small river in northwest Anatolia, a tributary of the Sakarya River

Azerbaijan

• Qarasu, Hajigabul
• Qarasu, Kurdamir
• Qarasu, Qabala
• Karasu Kumlakh or Qarasuqumlaq, Agdash Rayon

China

• Karasu, Xinjiang, a place at the foot of the Kulma Pass

Crimea

• Karasubazar

Japan

• Karasu, Mie

Kazakhstan

• Karasu District, Kostanay Region
• Karasu (village), administrative center of Karasu District

Kyrgyzstan

• several places, see Kara-Suu (disambiguation)

Tajikistan

• Karasu, Tajikistan, Vahdat District

Turkey

• Karasu, Sakarya, a town in Sakarya Province
• Karasu, Karacabey, a village in Bursa Province
• Karasu, Yenice, a village in Çanakkale Province
• Karasu, Refahiye, a village in Erzincan Province
• Karasu, Aşkale, a mahalle in Erzurum Province
• Karasu, Karayazı, a mahalle in Erzurum Province

Uzbekistan

• Karasu or Qorasuv, Andijan Province, adjacent to Kara-Suu, Kyrgyzstan

• Karasu, a character from the manga and anime series Yu Yu Hakusho
• Karasu, a Noein character
• Karasu, a ninja puppet in Naruto

• Karasu, an album in the 13 Japanese Birds series by Merzbow
• Karasu Bay, a fictional bay in the air combat video game The Sky Crawlers: Innocent Aces
• Karasu relief, a rock relief in Turkey, near where the Karasu River, the western branch of the Euphrates, joins the eastern branch of the Euphrates
• Karasu, a species of giant beaked whale

• Carasso family, a Sephardic Jewish family of Salonika, often spelled Karasu
  • Emmanuel Carasso (1862–1934), lawyer and politician
  • Isaac Carasso (1874–1939), Emanuel's nephew, founder of Groupe Danone
  • Daniel Carasso, Isaac's son, co-founder of Dannon in the U.S.
• Albert Karasu, Jewish-Turkish journalist
• Bilge Karasu (1930–1995), Turkish writer
• Oğuzhan Karasu (born 1995), Turkish volleyball player