ABSTRACT A cross-sectional study was conducted from October 2017 to April 2018 to determine the prevalence of nematode and trematode parasites in small scale dairy farms of Bahir Dar and its surroundings, Northwest Ethiopia. A total 275 cattle were in this study and registered according to their breed and age. The eggs of the parasites were identified using standard coproscopic examination techniques. The overall prevalence of parasites was 66.2% and 59.6% in wet and dry season, respectively. Out of these, 132(48%) and 97(35.7%) were found to be infected with nematode in wet and dry seasons, respectively. Similarly 143(52%) and 110(40.4%) were infected by trematode in wet and dry seasons, respectively. The prevalenthelmentic parasite species wereParamphistomum(44.4%) followed by Strongylespp(38.9%), Fasciola(22.2%), Schistosomia(12%), Ascaris(9.5%) and Trichuris(8.4%) in wet season. Likewise in dry season, Paramphistomum(32.4%) had higher prevalence followed by Strongylespp(30.5%), Fasciola(12.7%), Schistosomia(10.5%), Ascaris(6.9%) and Trichuris(6.5%). There was statistical significant difference (P<0.05) among age, breed, body condition, grazing system and seasons with risk of infection by nematode and trematode parasites. The higher prevalence was recorded in cross breeds, poor animal body condition, semi-intensive grazing system and wet seasons. Higher prevalence was also recorded in young and adult animals with the exception of Ascaris and Trichuris that was higher in calves. The current study indicated that there was high prevalence of nematode and trematode parasite infections in dairy cattle of Bahir Dar and its surroundings. Prevalence of nematode and trematoode parasites was greatly associated with risk factors like age, breed types, animal body conditions, grazing systems and seasons. Hence, strategic control approach and awareness creation to farm owners are very crucial to increase productivity or to minimize economic losses due to nematode and trematode parasite infections. Key Words: Prevalence; Risk Factors; Nematode,Trematode, Dairy Cattle; Bahir Dar and Cross Sectional Study