Abstract: The present invention relates to a glass breaking cap for a flashlight or baton, which has a bottom portion corresponding in configuration to and connectable with an end of the flashlight or baton, a top portion tapering upward such that the cap has a cross section whose two adjacent upper sides form a first included angle greater than 140 degrees, and a striking portion extending upward from a central area of the top portion. The striking portion is conical and has a cross section whose two adjacent upper sides form a second included angle less than 100 degrees. Thus, when the cap is connected to the end of the flashlight or baton and struck against a glass barrier, the striking portion creates a breaking point on the glass barrier, thus allowing the top portion to further crush the internal cohesion of the glass barrier and thereby break the glass barrier.