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Summary Background Pregnant women in settings with high HIV prevalence are at increased risk of HIV acquisition and subsequent vertical transmission. We implemented and evaluated a novel programme to provide pre-exposure prophylaxis (PrEP) in maternal and child health clinics in Kenya. Methods In collaboration with Kisumu County Department of Health, we integrated PrEP delivery within 16 maternal and child health clinics in Kisumu County (Kenya). Women and girls older than 15 years seeking maternal and child health services who tested HIV negative at that visit or within a month and were willing to receive PrEP counselling were interviewed to assess for HIV behavioural risk factors and offered PrEP. Correlates of PrEP initiation and continuation were assessed using Poisson regression in univariate and multivariate analyses. Potential correlates included in our analyses were age, marital status, marriage type, whether pregnant or post partum, gestational age (if pregnant), and HIV risk factors in the previous 6 months. Reasons for the decision to discontinue after having decided to initiate PrEP were evaluated. Women who initiated PrEP were followed up 1 month, 3 months, and 6 months after initiation. Findings Between Nov 20, 2017, and June 13, 2018, 9376 pregnant and post-partum women were assessed for behavioural risk factors and willingness to initiate PrEP. Overall, 2030 (21·7%) initiated PrEP, and 2027 had the status of their partner captured (153 [79·3%] of 193 women with partners living with HIV, 1178 [37·2%] of 3165 women with partners of unknown HIV status, and 696 [11·6%] of 5997 women with HIV-negative partners). Predictors of PrEP initiation in the multivariate analysis were: being younger than 24 years (adjusted prevalence ratio 1·14, 95% CI 1·02–1·28); having a partner living with HIV (6·96, 5·46–8·89) or of unknown HIV status (3·08, 2·50–3·81); gestational age of less than 26 weeks (1·22, 1·02–1·47); having been diagnosed or treated for a sexually transmitted infection (1·57, 1·20–2·06); having been forced to have sex (1·82, 1·38–2·42); having experienced intimate partner violence during the previous 6 months (1·65, 1·10–2·48); having shared needles while engaging in injection drug use (2·43, 1·69–3·50); and recurrent use of post-exposure prophylaxis (1·96, 1·36–2·82). Overall, 786 (38·7%) of 2030 women who initiated PrEP continued use after the first month, with 104 (68·0%) of 153 women who had a partner living with HIV continuing use. Having a partner living with HIV was the only predictor of PrEP continuation at 1 month in the multivariable model (1·98, 1·54–2·55). Frequent reasons for discontinuation were side effects and low HIV risk perception. No incident HIV infection was reported among women on PrEP. Interpretation Many women attending maternal and child health clinics had risk factors for HIV and elected to use PrEP, indicating that routinely accessed maternal and child health clinics can be an effective platform for PrEP delivery for young women. As PrEP awareness rises, PrEP provision in routine clinical settings such as maternal and child health facilities might contribute to decreased HIV incidence among young women. Funding US Department of State.