This dissertation examines the place of Hellenism in nineteenth-century literature as a background to my discussion of Algernon Charles Swinburne’s poetic treatment of Apollo, the Greek god of poetry and of the sun. My point of departure is the common view that sees the Victorians’ fascination with Hellenism as representing a collective sense of dissatisfaction with Christian culture, its politics, and morality. Raised High Anglican, Swinburne was an avid and devoted believer throughout his early life. However, a spiritual crisis which he experienced during his years in Oxford in the late 1850s caused him to grow extremely critical of Christianity and eventually forsake his faith by his mid-twenties. Yet Swinburne’s rejection of Christianity did not result in his rejection of spirituality. And indeed, throughout his poetic career, Swinburne searches for alternative deities that would replace the Christian God. One such deity is Apollo, who becomes a pivotal figure in Swinburne poetry starting with the 1878 publication of Poems and Ballads and in the collections that follow. Focusing on seven major poems written during a period of almost three decades, I show how Apollo serves as the main deity in an emerging Swinburnean mythology. Swinburne’s Apollonian myth, I show, consists of three stages: the invocation and conceptualization of Apollo as a new god by manipulating Biblical and Classical notions of divinity; the formation of a unique Apollonian theology; and the shift toward a nihilistic agnostic vision of spirituality. Each stage, I argue, presents the development of Swinburne’s thought, as well as his deep engagement with nineteenth-century debates about religion, mythography, and the reformative function of poetry. As such, my dissertation has two main purposes: first, expanding the scope of Swinburne scholarship by providing a new thematic context for his later poetry; and second, reclaiming Swinburne’s place in nineteenth-century intellectual history by showing his contribution and involvement in discussions about some of the period’s most central issues.