Recently, ‘Tuong da xanh (TDX)’ is a mango cultivar (also known as ‘Ba Mau’ or ‘Dai Loan’) grown widely in the Mekong Delta, Vietnam particularly in Gieng islet, Cho Moi district, An Giang province. Similar to the other cultivars, off-season flowering of TDX is implemented by collar drenching of Paclobutrazol (PBZ) used as a flower bud initiation agent, followed by foliar application(s) of Thiourea or KNO₃ to induce flowering. However, PBZ residue was reported to be able to remain for long time in both soil and leaf. In addition, Thiourea has been long labelled as a carcinogen, thus banned from use in the USA and Australia. Therefore, it is of utmost importance to look for alternatives for these two chemicals. The aim of this study was to investigate the effect of Uniconazole (UCZ), as a replacement for PBZ, on flowering of TDX mango. Results showed that UCZ applied either as collar drenching or foliar application is a good replacement for PBZ in terms of flowering rate and yield. Trees, collar drenched with UCZ (1.0 g a.i..m^-1 canopy diameter [c.d.]) followed by two sprays of KNO₃ (2.5% twice in one week) after 75 days, had flowering rate like those treated with PBZ 1.5 g a.i..m^-1 c.d. Similarly, for foliar application, the flowering rate of trees sprayed with 1,000, 1,500, and 2,000 ppm UCZ followed by bud breaking treatment using KNO₃ (2.5%, twice in one week) after 75 days was not significantly different to that of those treated with PBZ 1.5 g a.i..m^-1 c.d.