Frax or FraX or FRAX may refer to:

• Frax, a villain in the Power Rangers: Time Force fictional universe

• Frax, a character in the Bucky O'Hare fictional universe

• FraX, an abbreviation for Fragile X Syndrome or the associated gene

• FRAX, a tool for assessing risk of fracture due to osteoporosis developed by the University of Sheffield

• Frax, an abbreviation for Fractional Ownership

• Frax, an app for realtime fractal exploration

• FRAX, a fractional reserve stablecoin cryptocurrency