Heterogeneity is a diverseness of constituent structure.

Heterogeneity or heterogeneous may also refer to:

• Heterogeneity in statistics
• Heterogeneity in economics
• Study heterogeneity, a concept in statistics
• Heterogeneous relation

• Heterogeneous conditions in medicine are those conditions which have several causes/etiologies
• A heterogeneous taxon, a taxon that contains a great variety of individuals or sub-taxa; usually this implies that the taxon is an artificial grouping
• Genetic heterogeneity, multiple origins causing the same disorder in different individuals.
• Allelic heterogeneity, different mutations at the same locus causing the same disorder.

• A heterogeneous reaction, a reaction in chemical kinetics that takes place at the interface of two or more phases, i.e. between a solid and a gas, a liquid and a gas, or a solid and a liquid
• A heterogeneous catalysis, one in which the catalyst is in a different phase from the substrate

• Heterogeneity in landscape ecology, the measure of how different parts of a landscape are from one another.

• Heterogeneous computing, electronic systems that utilize a variety of different types of computational units
• Semantic heterogeneity, where there are differences in meaning and interpretation across data sources and datasets
• A data resource with multiple types of formats.

• Homogeneity and heterogeneity
• Homogeneity (disambiguation)
• Degeneracy