A mold for fabricating an optical fiber connector is provided. The mold includes a mold body, a core pin and a positioning block. The mold body defines a molding chamber, and the molding chamber has a lens forming portion for forming a lens. The core pin is configured for insertion into the molding chamber and forming an optical fiber insertion hole. The core pin includes a first portion and a second portion thinner than the first portion. The positioning block is configured for being arranged in the molding chamber. The positioning block includes an engaging hole for engagingly receiving the second portion.