Abstract: Background. There has been an increase in internet use amongst children and adolescents. With this, new forms of child victimization like Online Sexual Abuse (OSA) have emerged with serious negative consequences. Unfortunately, previous studies show that children and adolescents rarely disclose these incidents. However, most disclosure happens around peers. Objective. This research addresses the perspective of adolescents (not victims of OSA), potential recipients of the disclosure, within the context of disclosure of OSA committed by either adult or peer aggressors. Methods.The study was performed in two stages. We interviewed adolescents in Scotland using convenience sampling methods like social media adverts and recruitment posters and then conducted focus groups with adolescents recruited from high school in Chile. Participants and Setting. 51 adolescents (6 from Scotland and 45 from Chile) aged between 15-20 years participated. Results. Participants highlight these obstacles to disclosure: lack of clarity of OSA, factors relating to personal vulnerability, gender stereotypes and contextual factors. Facilitators to disclosure were understood as developing self-confidence of the adolescents, having trustworthy relationships within their social network and awareness about safe internet usage. Conclusion. Disclosure of OSA is considered similar to the disclosure of offline sexual abuse. However, some differences -like lack of clarity regarding the boundaries of the relationships on the Internet, presence of generational gap between adolescents and their parents or tutors in the use of internet- makes early disclosure of OSA highly challenging. However, peers seem to be a highly relevant agent in facilitating early disclosure. Key words: Disclosure; Online Sexual Abuse; Peers; Gender; Stigma; Blame Raahat Manrai (She/her) PhD Candidate in Clinical Psychology MSc Children and Young People's Mental Health and Psychological Practice School of Health in Social Science University of Edinburgh Medical School Teviot Place Edinburgh EH8 9AG T: (0)7721698416 E: r.manrai@sms.ed.ac.uk The University of Edinburgh is a charitable body, registered in Scotland, with registration number SC005336.