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The current research was undertaken to compare the proximate composition and antioxidant activity of different parts of green and ripe passion fruit. The proximate composition, bioactive compounds and antioxidant activity of different parts of passion fruit were analyzed by standard methods. According to the results, the ash content of the peel and seed of ripe passion fruit was higher than that of the green one, but only significant (P<0.05) for the seed. Besides, the crude fiber, carbohydrates, and protein content of the peel, pulp, and seed of ripe passion fruit were relatively higher (P<0.05) than those of the green one. At P<0.05, the fat content of green peel and pulp was higher than that of ripe, but the seed content of ripe was higher. The peel and pulp of green passion fruit contain the highest amounts of total polyphenol content (TPC) and total flavonoid content (TFC) than ripe passion fruit (P<0.05). The highest amount of TPC is contained in the seed of green passion fruit than in ripe fruit (P>0.05), but the seed of ripe fruit contains TFC almost twice as much as green fruit (P<0.05). It was also found that the peel and pulp of ripe passion fruit contain a higher percentage of total antioxidant activity (TAA) and vitamin C (P<0.05) than the pulp of a green one. The seed of the green one contains a slightly higher percentage of TAA than the seed of the ripe fruit (P<0.05), but vitamin C was opposite (P<0.05). It is concluded that the pulp, peel, and seed of green and ripe passion fruit have great potential as a health-promoting source that is normally underutilized. [ABSTRACT FROM AUTHOR]