A cross-sectional behavioural and biological survey was conducted among FSWs in 2018 in Rwanda. Time-location sampling was used to recruit participants. The factors assessed included sociodemographic characteristics, sexual behaviour, alcohol and other drugs consumption, condom use and information about HIV and STIs. Inconsistent condom use was present if a FSW reported that during the last 30 days, she sometimes or never used a condom with clients. Proportions were used for sample description and multiple logistic regression was performed to analyse factors associated with inconsistent condom use