Bactrocera tau), the pumpkin fruit fly or the tau fruit fly, is a species of fruit fly in the family Tephritidae.

The species is native to tropical and subtropical Asia.

[1] It is a major pest species of melons and other cucurbits.

[citation needed] In 2023 the tau fruit fly was found in California.

In response, the California Department of Food and Agriculture imposed a quarantine on a portion of Los Angeles County.