Ringer(s) may refer to:

• Ringer, in sports idiom, an impostor, especially one whose pretense is intended to gain an advantage in a competition
• Ringer (comics), a Marvel Comics villain
• Ringer (EP), an EP by Four Tet
• Ringer T-shirt, a style of T-shirt
• Bell-ringer, one who plays bells, especially church bells
• Road course ringer, a non-NASCAR driver hired to race at a road course
• Lactated Ringer's solution, also known as Ringer's, a fluid used in medical treatment
• Stockman (Australia), known as a ringer in the Top End
• The mechanism in a telephone that announces an incoming call
• In horseshoes, a shoe that encircles the stake
• A member of Tolkien fandom
  • , a documentary on the subject
• An ornithologist trained in bird ringing
• A game piece used for scoring in the 2007 FIRST Robotics Competition game Rack 'n Roll
• Ringer (film), a 1996 thriller starring Timothy Bottoms
• Ringer (TV series), a CW show starring Sarah Michelle Gellar

Ringer bezeichnet:

• einen Sportler im Ringen
• Ringerlösung, eine wässrige medizinische Infusionslösung
• in Australien den Beruf des Cowboys

São soluções isotônicas ao plasma sanguíneo, formadas por eletrólitos ou moléculas de pequenas dimensões sem carga formal. Podem conter sódio, potássio, cálcio, magnésio, cloreto, glicose e tampões, como acetato ou citrato, para manter as condições mais próximas as do sangue.