An attempt was made during 2011 to study the effect of different physico-chemical treatments on ripening behaviour and post-harvest quality of Dashehari mango with a view to improve storage quality and shelf-life of mango fruits. The experiment was designed under completely randomized design (CRD). Out of ten treatments applied the fruits treated with ethrel 750 ppm had significantly better fruit quality over other treatments in respect of physical parameters i.e., fruit skin colour, flavour/aroma, organoleptic taste, marketability, fruit firmness, specific gravity (0.87), moisture loss (12.54%), decay (3.11 %), total soluble solids (20.40⁰Brix), sugar content (14.69%), acidity content (0.16%) and sugar/acid ratio (91.81) followed by Ethrel 500 ppm {specific gravity (0.86), moisture loss (13.25%), decay (4.20 %), total soluble solids (TSS, 18.10⁰Brix), sugar content (14.61%), acidity content (0.18%) and sugar/acid ratio (81.16)}. The post-harvest treatment i.e., pedicellate fruits with ethrel + bavistin (750+1000 ppm) was found to be next best over other treatments in respect of specific gravity (0.86 and 0.83), moisture loss (14.08% and 14.02%), decay (4.80 % and 4.99%), total soluble solids (19.20⁰Brix and 19.00⁰Brix), sugar content (13.59% and 13.89%), acidity content (0.19% and 0.18%) and sugar/acid ratio (71.84 and 81.70). Based on results obtained from the present study, it can be concluded that ethrel 750 ppm was found to be best post-harvest treatment on account of physical and chemical parameters of Dashehari mango.