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We present a simple yet flexible asymptotic framework for deriving the efficient influence function and the semiparametric efficiency lower bound for a family of network causal effects under partial interference. An important corollary of our results is that one existing estimator, that proposed by Liu et al. (2019), is locally efficient. We also present other estimators that are efficient and discuss results on adaptive estimation. We illustrate application of the efficient estimators in a study of the direct and spillover effects of conditional cash transfer programmes in Colombia.<\/jats:p>","DOI":"10.1093\/biomet\/asac009","type":"journal-article","created":{"date-parts":[[2022,1,31]],"date-time":"2022-01-31T20:12:35Z","timestamp":1643659955000},"page":"1015-1031","source":"Crossref","is-referenced-by-count":12,"title":["Efficient semiparametric estimation of network treatment effects under partial interference"],"prefix":"10.1093","volume":"109","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8315-1522","authenticated-orcid":false,"given":"C","family":"Park","sequence":"first","affiliation":[{"name":"University of Wisconsin\u2013Madison Department of Statistics, , Madison, Wisconsin 53706, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"H","family":"Kang","sequence":"additional","affiliation":[{"name":"University of Wisconsin\u2013Madison Department of Statistics, , Madison, Wisconsin 53706, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"286","published-online":{"date-parts":[[2022,2,8]]},"reference":[{"key":"2022112917593018600_B1","doi-asserted-by":"crossref","first-page":"413","DOI":"10.1093\/biomet\/63.3.413","article-title":"Multivariate binary discrimination by the kernel method","volume":"63","author":"Aitchison,","year":"1976","journal-title":"Biometrika"},{"key":"2022112917593018600_B2","doi-asserted-by":"crossref","first-page":"1432","DOI":"10.1214\/19-AOAS1314","article-title":"Causal inference from observational studies with clustered interference, with application to a cholera vaccine study","volume":"14","author":"Barkley,","year":"2020","journal-title":"Ann. 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