A canister attachment for leaf blowers/vacuums is an apparatus that attaches to existing leaf blower/vacuums to provide a user with a facilitated means to collect animal waste or debris. The apparatus comprises a suction nozzle assembly (1), a canister (9), a suction duct (28), a vertical support assembly (23), and a leaf blower/vacuum (35). The suction nozzle assembly (1) comprises a canister mount (2) and a nozzle (6). The canister (9) comprises a nozzle mount (10), a lateral surface (14), a filter plate (16), a duct opening (19), and a first (15) and second (17) chamber. The suction duct (28) comprises a duct canister mount (29), a duct channel (30), and a leaf blower/vacuum mount (33). The configuration of the aforementioned components provides the user with an attachment that utilizes the suction force of existing leaf/blower vacuums to collect animal waste or debris.