A combination adhesive tape dispenser/applicator for one-handed dispensing of pressure sensitive adhesive tape from a roll and simultaneously applying the tape to a substrate. The combination tape dispenser/applicator allows all operations to be performed single-handedly, and without the user ever having to directly touch the tape. In addition, there is no need to pre-measure or estimate the length of tape needed as the desired length of tape is dispensed as it is being applied to the substrate.