Lack of durable resistance in bread wheat cultivars is the main reason for stem rust epidemic which could limit yields in Ethiopia. Therefore, the present study was conducted under greenhouse and field conditions to observe and evaluate slow rusting resistance to stem rust among bread wheat cultivars. To achieve these objectives, 25 Ethiopian common bread wheat cultivars were tested for their seedling and adult plant reaction to stem rust both in greenhouse at Ambo and the field experiment at Adet was. The field experiment was conducted during 2016 main cropping season and was planted in randomized complete block design with three replications. Morocco was planted perpendicular to the experimental blocks to serve as spreader rows. The spreader rows were inoculated artificially with TTKSK race in order to provide artificial epidemic condition. Parameters used as criteria to identify slow rusting included terminal rust severity (TRS), coefficient of infection (CI), relative area under disease progress curve (rAUDPC) and infection rate (Inf-rate). Among these parameters, TRS, CI and rAUDPC were found to be reliable to assess slow rusting in the cultivars. The results indicated that wheat cultivars (Shorima, Hoggana, Galil, Senkegna, Hidase, Tay, Dinkinesh, Gassay, Millenium, Densa, Guna and Shina) had low disease severities (30-40%) with compatible field responses (MR), lower rAUDPC values (>30%) and CI (< 20%) and were identified to have good level of slow rusting resistance. Cultivars Shorima, Hoggana, Senkegna, Hidase, Dinkinesh, Millenium, Densa, Guna and Shina had moderate values for slow rusting parameters and were identified as possessing moderate level of slow rusting. The slow rusting cultivars identified from the current study can be used for further manipulation in wheat improvement programs. However, to come up with precise and reliable recommendation, the experiment has to be repeated over location and season.