A canister attachment for leaf blowers/vacuums is an apparatus that attaches to existing yard waste leaf blower/vacuum's to provide a user with a facilitated means to collect solid animal waste or other debris deposited on the ground. The apparatus comprises a suction nozzle assembly, a canister, a suction duct, a support assembly, and a leaf blower/vacuum. The suction nozzle assembly comprises a canister mount and a nozzle. The canister comprises a nozzle mount, a lateral surface, a filter plate, a duct opening, and a first and second chamber. The suction duct comprises a duct canister mount, a channel, and a leaf blower/vacuum mount. The configuration of these components provides the user with a mobile accessory that utilizes the suction from existing conventional leaf blowers/vacuums to siphon animal waste through the nozzle and into the canister. Furthermore, the apparatus provides an exhaust catch to prevent accidental discharge through the leaf blower/vacuum.