Background: Since 1970, different parts of Ethiopia have been recurrently affected with cholerarnoutbreaks. During such public health emergencies, timely and correct information can supportrnpeople at risk to take appropriate protective actions, prevent disease and injury, decreasernunnecessary care-seeking, and facilitate relief and recovery attempts. As risk communicationrnactivities are complex and costly usually, evaluation assessment are the best approach to advancernrisk communication interventions and to enhance the feature of health communication materials. rnObjectives: This study aims to evaluate the effectiveness of risk communication process andrnhealth communication materials done for cholera outbreak at Addis Ababa, Ethiopia. rnMethods: the study is conducted at Addis ketema sub-city, Addis Ababa Ethiopia. The study usedrncommunity-based cross-sectional design using mixed method. A total of 605 adults were selectedrnusing systematic random sampling for quantitative data and 7 purposely selected adults for Indepthrninterviewrnandrn3rnkeyrninformantsrnwererninterviewedrnforrnqualitativerndata.rnDatarnwererncollectedrnrnusingrnrna pre-tested structured interviewer-administered questionnaire, semi-structured interviewrnguides and checklist. Five printed communication materials and three cholera spots were selectedrnrandomly from the available materials for evaluation. Quantitative data were analyzed using SPSSrnversion 25. A multiple linear regression analysis was done to identify predictors for knowledge forrncholera and P-value < 0.05 was used to declare the statistical significance. Qualitative data werernentered into open code version 4.02 for analysis and then analyzed using thematic analysis. rnResult: The response rate of this study was 96.1%. Respondents exposed for cholera relatedrnmessages and outbreak information were 71.8% and 52.7% respectively. Respondents havernmoderate knowledge for cholera with (M=14.72 and SD Â±4.02) with (0-34) scale range. Sociodemographicrnvariables,rnsourcesrnofrnhealthrninformation,rnexposurernforrncholerarnmessagesrn&rnoutbreakrnrninformationrnvariablesrnexplainedrnthernvariancerninrnknowledgernaboutrncholerarnbyrn44.5%.rnBothrnTVrn&rnrnradiorncholerarnspotsrnwerernfoundrnasrnsimplernandrneasyrntornunderstandrnandrnprintedrnhealthrncommunicationrnrnmaterialsrnrnscore low quality. Poor documentation, lack of data management system and lessrnattention given for risk communication activities were seen as a gap in the risk communicationrnprocess done for cholera outbreak (2019) in Addis Ababa, Ethiopia. rnConclusion: as this study revealed that risk communication messages has effect in increasingrnindividualsâ€™ knowledge on disease and its prevention. Even though the cholera spots were foundrnto be simple and easy to understand the quality of printed materials were low and less attentionrngiven for the risk-communication activities affect the effectiveness of the risk-communicationrnprocess. Therefore, strengthening risk communication and materials development process is veryrnimportant to bring desired effects in disease prevention strategies and for effective emergencyrnresponses in the future.