Background: Adolescents are at high risk of unintended pregnancy and consequent unsafe abortion. Evidence from Lao PDR suggests a high but underreported prevalence of induced abortion, especially amongst adolescents. Research suggests adolescents are less likely to have an unsafe abortion when they have accurate knowledge about abortion and hold positive attitudes towards abortion. Objective: The purpose of this study was to investigate awareness and attitudes towards abortion and associated factors in Lao PDR. Methods: This study used a descriptive, cross-sectional design. The study was conducted between January and May 2019 in two different provinces within Lao PDR, namely, Khammouane and Champasack provinces. Participants included in-and out-of-school male and female adolescents (n = 800). Data were collected using a structured questionnaire and entered into the EPI Data version 3.1. All analysis was undertaken using STATA v.13. Univariate analysis and frequency distributions were used to study the pattern of responses and bivariate descriptive analysis to report attitudes and knowledge by participant characteristics. The association between participant characteristics and overall scores of attitudes towards abortion was evaluated using multiple logistic regression. Findings: Most respondents (78.8%) were aware of the processes and potential consequences of becoming pregnant at a young age. One-third of respondents (31.5%), were aware of induced abortion. Of those, only 12.1% held positive attitudes towards induced abortion. Factors associated with positive attitudes towards abortion were ethnicity, mother's education and ever having had sex. Conclusion: In the case of unintended or unwanted pregnancy, adolescents must also have adequate knowledge and access to safe abortion and associated counselling services. This study suggests a need to increase sexual and reproductive health literacy including information about safe abortion. This requires a holistic approach to sexual education and needs the support and involvement of adolescents themselves as well as parents, community members and healthcare workers.