This chapter reviews the influence the Tractarian Movement had on Hopkins. It provides an overview both of the ecclesiastical discussions and disputes which shaped Hopkins as a young man, and of the Tractarian literary and theological environment into which we can place his poetic output. It discusses the religious controversies Hopkins encountered in his undergraduate years, particularly around the perceived ‘Romanism’ of the Tractarian Movement. It then considers the themes of reserve and sacramentality characteristic of Tractarian poetry before turning once again to theology. Hopkins’s encounter with patristic ideas, it is suggested, proved deeply formative. The chapter ends with a brief reflection on how the Tractarian theology of participation and presence is apparent throughout Hopkins’s mature work.