Tonic
- Herbal tonic
- Names for soft drinks in the United States
- Patent medicine
- Tonic (Tonic album)
- Tonic (band)
- Tonic (film)
- Tonic (music venue)
- Tonic (music)
- Tonic (physiology)
- Tonic (radio program)
- Tonic Sol-fa (a cappella group)
- Tonic sol-fa
- Tonic suit
- Tonic syllable
- Tonic water
- Tonie
- Tonio (name)
- Tonči