Background: Timely starting of breastfeeding is defi ned as the starting of breastfeeding within one hour after childbirth. Globally mothers who practiced breastfeeding within one hour were less than half in percent. In least developed countries like Eastern and Southern Africa including Ethiopia infant breastfeeding practice within one hour were low. The aim of this study was to assess timely initiation of breastfeeding and associated factors among mothers who have an infant less than six months of age in Gunchire town, Southern Ethiopia. Methods:The study was conducted from May 1 to 28, 2019 in Gunchire town. Data were collected by using a structured face to face interview questionnaire. The community based crosssectional study was employed on 333 women. The study participants were selected by Simple random sampling techniques. The data were coded, entered, cleaned and analyzed by SPSS with windows version 21.0. Binary and multivariable logistic regression statistical model was used. Adjusted odds ratio with 95% CI was computed to see the strength of association. Results:In this study the magnitude of timely initiation of breastfeeding was 80.5%. Governmental employed mothers (AOR=2.914, 95% CI: 1.139, 7.46), Antenatal care follow up (AOR=5.99, 95% CI: 1.29, 27.81), Baby skin to skin contact (AOR=2.4, 95% CI: 1.092, 5.34), Vaginal delivery (AOR=5.82 95% CI: 1.68, 20.14) Institutional delivery (AOR=5.5, 95 CI%: 1.66, 18.3), Good knowledge of breastfeeding (AOR=4.02, 95% CI: 1.04, 15.59) and Breast disease (AOR=0.24, 95% CI: 0.08, 0.73) were signifi cantly associated with timely starting of breastfeeding.