Iminodiacetic acid is the organic compound with the formula HN(CH2CO2H)2, often abbreviated to IDA.

A white solid, the compound is a dicarboxylic acid amine (the nitrogen atom forms a secondary amino group, not an imino group as the name suggests).

Complexes of IDA and EDTA were introduced in the early 1950s by Schwarzenbach.

[2] IDA forms stronger complexes than the bidentate ligand glycine and weaker complexes than the tetradentate ligand nitrilotriacetic acid.

[3][4] Iminodiacetic acid is an important intermediate in one of the two main industrial processes used to manufacture the herbicide glyphosate.