HLA-A26 (A26) is a human leukocyte antigen serotype within HLA-A serotype group.

The serotype is determined by the antibody recognition of α26 subset of HLA-A α-chains.

For A26, the alpha "A" chain are encoded by the HLA-A*26 allele group and the β-chain are encoded by B2M locus.

A26 is more common in West Pacific Rim (Taiwan to Hokkaido).

A26 reasonably good serotyping with no overt false recognition.. A26 Serotype is associated with adult T-cell leukemia in Japanese.