Indicator may mean:

• pH indicator, a chemical detector for protons in acid-base titrations
• Redox indicator, a chemical detector for redox titrations
• Complexometric indicator, a chemical detector for metal ions in complexometric titrations
• Dial indicator, an instrument that measures small distances
• Honeyguide, a genus of birds
• Turn signal of an automobile
• Economic indicator or business indicator
• Ecological indicator of ecological health
• Indicator function of a subset of the domain, a concept in mathematics

Indikator | Indicateur | אינדיקטור | Indikator | Indikátor | Indikaattori