Background: Sexually Transmitted Infections (STIs) are a group of infections transmittedrnthrough unsafe sexual intercourse. Promotion of condom use is the simplest and cost effectivernstrategies for preventing sexually transmitted diseases. However, condom utilization amongrnadults in Ethiopia is not satisfactory.rnObjectives: To assess knowledge, attitude and practice towards sexually transmitted infectionsrnand condom utilization among daily laborer adults in the construction sector.rnMethods: A cross sectional study was conducted in June 2016 to may 2017 among dailyrnlaborers engaged in construction sector in the Laga Tafo area. Study participants were selectedrnby systematic random sampling. Data was collected by standardized quastionare and enter by Epirninfo. By using SPSS version 21.1 data were analyzed in bivariate and multivariate logisticrnregression.rnResults: A total of 364 daily laborers were participated in the study. According to the recentrnstudy 245(67.3%) and 285(78.3%) of respondents were knowledgeable about STIs and condomrnuse respectively. Incase of attitude towards STIs and condom use more than half of studyrnparticipants had favorable attitude towards STIs and condom use.rnOnly 165(48.2%) sexually active participants were ever used condom during sexual intercourse.rnOf which ever used condom 109 of them consistently used condom with in the past six months.rnAmong currently sexually active respondents the rate of self reported STD was 10.7%.rnRespondents those who do not chew khat before sexual intercourse 0.122 time less likely to havernhistory of STIs (AOR=0.122, 95% CI :( 0.053, 0.280). Participants those who do not have formalrneducation 0.062 times less likely to use condom than those who were completed secondary andrnabove [AOR = 0.062, 95% CI, (0.021, 0.181)).rnConclussion and recommendation: Though of large proportion of study participants werernhaving awareness on STIs and condom use; majority of them practicing risky sexual practice.rnThere was a gap between knowledge on STIs and sexual behavior of respondents. Therefore,rnhealth education program aimed at bringing behavioral change should be planned andrnimplemented.