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The kinetics of martensite decomposition in hydrogenated Ti–6Al–4V alloy samples was studied. To produce the martensite structure, the samples containing 0, 10, 20 and 30 at.% H were annealed in the β phase field and water quenched. Optical microscopy, transmission electron microscopy, X-ray diffraction analysis and microhardness testing techniques were utilized to study the phases and phase transformations and to obtain time–temperature-transformation (TTT) diagrams for the martensite decomposition. The martensite structure of the hydrogenated samples consisted of a mixture of hexagonal close packed (hcp) α′ and orthorhombic α″ martensites. The amount of the orthorhombic α″ martensite increased from 0 to ∼80 vol.% when the hydrogen content of the alloy was increased from 0 to 30 at.%. During aging at temperatures below the β transus temperature and above the martensite start temperature …