Seno, Séno or Senó may refer to:

Places 
 Seno, Aragon, a town in Spain
 Seno, Laos
 Séno Province, Burkina Faso
 Seno Skyring, an inland sound in Chile
 Seno Station, Hiroshima, Japan

People with the surname 
 Frank Seno (1921–1974), American football player

Fictional characters 
 Alice Seno/Seno Arisu and Mayura Seno, from the Japanese manga Alice 19th
 Aiko Seno, a.k.a. Mirabelle Haywood, a character from the anime series Ojamajo Doremi
 Koji Seno, her father
 Atsuko Seno (née Okamura), a.k.a. Miriam Haywood, her mother

See also
 
 Sein (disambiguation)
 Senoi, an indigenous people of Malaysia