Tonic may refer to:
Tonic water, a drink traditionally containing quinine
Regional name for soft drink—a carbonated beverage, used in eastern Massachusetts and parts of Maine and New Hampshire.
Tonic (physiology), the response of a muscle fiber or nerve ending typified by slow, continuous action
Tonic syllable, the stressed syllable of a word
Herbal tonic, a herbal medicine with tonic effects
Tonic (music), the tonal center of a musical scale
Tonic (band), an American rock band
Tonic (Tonic album), 2010
Tonic (music venue), a New York City music venue, 1998–2007
Tonic (Medeski Martin & Wood album), 2000
Tonic (radio program), Canadian radio program
Tonic suit, a garment made from a shiny mohair blend that was fashionable among the Mods of the mid-1960s
Tonic (film), a Bengali film
