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Post-transplant relapse remains a major challenge in T-ALL, with limited effective salvage options. We report on eight T-ALL patients who received low-dose chidamide (5 mg once weekly) as maintenance therapy after allogeneic HSCT. With a median follow-up of 22.7 months, the estimated 2-year OS and EFS are both 87.5%. Seven patients (87.5%) remain in continuous complete remission with sustained MRD negativity. Grade 3-4 neutropenia occurred in 57.1% of evaluable patients but was clinically manageable. This case series demonstrates that a low-dose chidamide maintenance regimen is feasible, well tolerated, and promising in this setting.