The Flash ring is a ring owned by Barry Allen that is used to store and summon his Flash suit.

Barry Allen, the second Flash, uses this ring to compress and conceal his costume while operating in his civilian identity. By thumbing a small stud on the side, the ring opens and releases the costume, allowing Barry the ability to change into it at super-speed.

The electromagnetic properties of Barry's Speed Force energy create a thermal expansion, allowing the pieces of the suit to shrink and expand, as well as allows him to conduct the pieces around his body at will. Barry originally created the ring for practicality, as well as a symbol to remind himself of why he is the Flash. For this reason, he decided to take both his parents' wedding rings and forge them together to create his ring.