Background; Emergency Department triage is a small but vital part of health care. It is therninitial phase of Emergency patient care, regardless of mode of arrival and point of care wherernthe triggers make independent decisions regarding patients that have limited information. Theserndecisions influence the entire patient visit in the department which is often made autonomouslyrnand under time constraints. ED triage is mostly performed by nurses. Nursesâ€™ knowledge andrnskill has been cited as influential factor. But there has been no study conducted in Ethiopia withrnthis area. So the purpose of this study was to asses knowledge and skill of nurses towards EDTrnand identifying factors affecting it among selected public hospital adult EDS of Addis Ababa,rnEthiopia.rnObjective; To assess knowledge and skill of triaging with associated factors among nursesrnworking in selected adult emergency departments of three public hospitals in Addis Ababa,rnEthiopia from Dec 2016-June 2017GC.rnMethod and materials; Both descriptive cross sectional and observational study design werernused and data were collected using structured questioners, observational checklist, andrnequipment review guide. The study populations were all nurses who were (employ) working inrnadult emergency department of Tikur Anbesa Specialized hospital, AaBET trauma center andrnAlert specialized hospital. Data were analyzed by simple frequency, Bivariet and multiplernlogistic regressions using spss version 24 computer software.rnResult; response rate of the study were (98%). majority of the respondents were malern61(46.2%). more than three fourth (84.1%) of the respondents had BSC degree while the rest ofrnthem were diploma holders. nearly three fourth (72%) of respondents had poor knowledge withrnthe mean score of (18.2, SD=3.8). More than half (67.4%) of respondents perceive their overallrnskill as good with the mean score of (mean=111, SD=9.4) and among the three hospitalsrnobserved two had nurses assigned for triage. Among the observed nurses blood pressurernmeasurement, pulse rate and oxygen saturation was assessed by all nurse but respiratory raternwas not assessed by (95%). breathing pattern, chest movement and pulse status was not assessedrnby majority of nurses. At Alert specialized hospital it was difficult to say there is triage inrncomparable with the other two. Because there is no nurse specifically assigned for triaging .inrnspite of this patient are categorized in priority group but they are not assigned to respectivernarea. Triage skill had significant association with training experience and ED work experience.rnConclusion and recommendation in conclusion the participants of this study had significancernknowledge deficit with reliable skill. In addition the observational analysis shows gap amongrnthose selected hospital. To minimized and solve knowledge and skill gap and increase nursesrncompetency the investigator recommend continuous training and refreshing courses followedrnby supportive supervision is important.