Abstract: A dive mask safety strap prevents the displacement or loss of a mask while diving into the water or at other times of vigorous activity while diving. Loss of a mask can subject the diver to danger, especially while in turbulent or murky waters, or in enclosed underwater places. The safety strap extends from one side of the dive mask to the other and is tightened under the user's chin, thereby preventing upward displacement and loss of the mask In addition, the strap extends around the user's neck to provide additional protection against mask displacement. The safety strap is contained to the diver's head and neck area and does not require attachment to an article of clothing.