Technical Abstract: Mango fruit (Mangifera indica L.), cv. 'Cogshall', 'Kent' and 'Keitt' were harvested at different maturities (61 - 115 days past flowering for 'Cogshall') and at different sizes (276 to 894 average gFW for 'Kent' and 364 to 1,563 gFW for 'Keitt'). Immediately after harvest or after one week of ripening at room temperature, fruit were homogenized or left intact and evaluated by electronic nose (e-nose) or by gas chromatography (GC) for aroma and other volatiles as well as for solids and acids. Volatile data from the different harvest maturities and ripening stages were discriminated by using multivariate statistics (Discriminant Factor Analysis). Both the e-nose and GC were able, in most cases, to separate fruit from different harvest maturities (especially for 'Cogshall' mangoes) at both the green and ripe stages as well as discriminate green from ripe fruit and fruit from the different varieties. Solids and acids data indicated that later harvest maturities resulted in sweeter fruit and later-harvested fruit had generally higher levels of total volatiles. Mango fruit volatiles may be useful as maturity markers to determine optimal harvest maturity for mango fruit that results in full quality upon ripening.