Background: Measles is a highly infectious viral disease that can cause permanent disabilitiesrnand death. We investigated measles outbreak to identify the magnitude and factors associatedrnwith measles in Cheta woreda, Kefa Zone, SNNPR 2016.rnMethods: We investigated 50 cases and 100 controls. We used a descriptive study followed byrnun-matched 1:2 cases to controls were conducted from February to March 2016. We defined arnsuspected measles case as any person with fever, rash, cough, and coryza or a person suspectedrnof measles by a clinician. Four blood specimens were collected for laboratory confirmation. Datarncollection instrument was prepared. Multivariate logistic regression analysis was conducted byrnusing Epinfo 7.rnResult: A total of 136 cases with AR 10.6/1000 and five deaths (CFR 3.6%) were identified.rnThe median age of the cases was 3 years and IQR age was between 2 and 5years. Thirty-five ofrnthe cases (70%) and thirty-four (34%) of the controls were not vaccinated. Twenty-nine (58%)rncases and 45 (45%) controls were males. The risk factors for contracting measles are - history ofrncontact with suspected or confirmed cases (AOR=18.00 CI 4.31-80.46). Family size peoplesrnliving in one house more than five (AOR= 4.00 CI 1.34-11.98), Being vaccinated was protectiverneffect from acquiring measles (AOR= 0.30 CI 0.10-0.78), Knowledge about measles disease isrnvaccine preventable (AOR= 0.27 CI 0.10-0.73).rnConclusion: The most affected age group under five (54%) years followed by 5-14 (32%) yearsrnof age. History of contact with suspected or confirmed cases, Un-vaccination, living people morernthan five members and Lack of knowledge of mother or caretaker were associated risk factors.rnWe recommended supplementary measles vaccination for under 15 children, strengthening ofrnroutine immunization defaulter tracing, strengthening of cold chain management and awarenessrncreation in the community.rnKey words: Measles; Immunization; Outbreak; Cheta