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Introduction Nigeria, Ethiopia and Tanzania have some of the highest teenage pregnancy rates and lowest rates of modern contraceptive use among adolescents. The transdisciplinary Adolescents 360 (A360) initiative being rolled out across these three countries uses humancentred design to create context-specific multicomponent interventions with the aim of increasing voluntary modern contraceptive use among girls aged 15–19 years. Methods The primary objective of the outcome evaluation is to assess the impact of A360 on the modern contraceptive prevalence rate (mCPR) among sexually active girls aged 15–19 years. A360 targets different subpopulations of adolescent girls in the three countries. In Northern Nigeria and Ethiopia, the study population is married girls aged 15–19 years. In Southern Nigeria, the study population is unmarried girls aged 15–19 years. In Tanzania, both married and unmarried girls aged 15–19 years will be included in the study. In all settings, we will use a prepopulation and postpopulation-based crosssectional survey design. In Nigeria, the study design will also include a comparison group. A one-stage sampling design will be used in Nigeria and Ethiopia. A two-stage sampling design will be used in Tanzania. Questionnaires will be administered face-to-face by female interviewers aged between 18 and 26 years. Study outcomes will be assessed before the start of A360 implementation in late 2017 and approximately 24 months after implementation in late 2019. Ethics and dissemination Findings of this study will be widely disseminated through workshops, conference presentations, reports, briefings, factsheets and academic publications. [ABSTRACT FROM AUTHOR]