Variable is an IMGT keyword which may refer to:
- a gene: V-GENE
- an exon: V-EXON
- a region: V-REGION
- a domain: V-DOMAIN of the immunoglobulin (IG) and T cell receptor (TR) chains (encoded by the V-J-REGION or V-D-J-REGION, depending on the IG or TR chains).
Note that "V-LIKE-DOMAIN" refers to the V-like domain of IgSF proteins other than IG or TR.