摘要:Background: Youth-Friendly Services (YFS) is an evidence-based public health intervention aimed to reduce sexual and reproductive health problems among youth. To achieve the desired outcomes, YFS has to be implemented with a high level of fidelity. However, there is an evidence gap in its implementation with fidelity. Hence, the main objective of the study was to describe the level of implementation fidelity of YFS among public health centers in Central Gondar Zone, northwest Ethiopia. Therefore, this study investigated the level of implementation fidelity of YFS among public health centers in Central Gondar Zone, northwest Ethiopia. Methods: An institutional-based cross-sectional study was conducted from September to December in 2019. A total of 1029 youths, who came to 11 health centers where YFS has been implemented were randomly selected. A validated tool, comprised of 65 Likert scaled items, designed to measure the three dimensions of fidelity was used to collect data. Face to face clients exit interview approach was used to collect the data. Summary statistics were calculated for each fidelity dimension first, and then the overall fidelity of implementation score was computed. Results: Overall, only 48 (4.7%; 1.6–11.3%) of youth received the YFS with a high level of implementation fidelity. Whereas 770 (74.8%; 57.6–90.5%) and 211 (20.5%; 912.7–31.0%) of youth received the YFS with a medium and low level of implementation fidelity, respectively. Considering each fidelity dimension, 241 (23.4%) youth received the YFS with a high level of adherence, 212 (20.6%) received the YFS with a high level of the structural quality of care, 323 (31.4%) received the YFS with a high level of process quality of care, 508 (49.3%) received the YFS with a high level of outcome quality of care, and 114 (11.1%), received the YFS with a high level of participant responsiveness. Conclusion: The identified low level of implementation fidelity of YFS indicates the urgent need to strengthen the YFS by the government and programmers. Further studies that can address barriers to the implementation fidelity of Youth-Friendly Services are recommended. In addition, further analysis to know the factors that may influence the fidelity of YFS are recommended.