Abstract: A roller wheel guard for in-line roller skates, is formed of an envelope-shaped body of flexible material such as woven nylon, open at the top, with a rubbery bottom. The envelope-like body receives the series of aligned wheels and extends up to just below the boot of the skate. Side panels of the guard have rear extensions forming at least one strap to be wrapped tightly around the rearmost wheel or the brake when the guard is installed. A further, vertical strap is included, secured to the body and of an adjustable length so as to extend to the top of the back edge of the boot, with an attachment such as a clip for securing to the back of the boot, thus forming a handle when the guard is in place. Preferably a pull ring is included on the strap, enabling the user to pull upward on the back of the wheel guard body, to tightly position the guard over the wheels when installed and to adjust the length of the vertical strap to accommodate the particular size of wheel assembly.