Indium does not occur in the native state. It is widely distributed in Nature although generally in low concentrations. The Earth has been estimated to contain 0.1 ppm of indium, about the same abundance as silver. It is found in many ores including those of iron, lead, copper, tin and particularly zinc. Like many of the rarer metals indium becomes concentrated in by-products during recovery of the major metals.

The occurrence of indium has been reported in several countries, including Canada, Finland, Germany, Italy, Japan, Peru, Sweden, USA and ex-URSS.