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
• Zeta potential, a property of interfaces in fluids for Zeta potential titration
• Dial indicator, an instrument that measures small distances
• Indicator, a genus of birds in the honeyguide family
• Automotive lighting of an automobile
• Economic indicator or business indicator
• Technical indicator, a tool used in the technical analysis of financial securities
• Ecological indicator of ecological health
• Indicator function of a subset of the domain, a concept in mathematics

de:Indikator (Begriffsklärung) fr:Indicateur nl:Indicator pt:Indicador sk:Indikátor sr:Indikator fi:Indikaattori zh:???