The Epistles (Latin: Epistulae) of Horace are two volumes of poems of which the first was probably published in 20 or 19 BCE. They are written in the form of letters, and critics have long debated whether this is simply a literary device, or reflects some genuine correspondence. In Epistle 1, Horace claims to have abandoned lyric poetry for philosophy, and a strong element of epicureanism pervades the work, informing many memorable sayings.
Horace's Art of Poetry, originally the third volume of the epistles, is now usually treated as a separate work.
Free online texts
Loebulus: L194 - Horace - Satires. Epistles. Ars Poetica. Public domain Loeb edition. PDF format.
Gutenberg: The Satires, Epistles & Art of Poetry of Horace, translated by John Conington. EPUB, HTML, MOBI and TXT formats.
Poetry in Translation: The Satires, Epistles and Ars Poetica, translated by A.S. Kline (2003-05). Multiple formats.
University of Adelaide (Internet Archive): The Works of Horace, translated into English Prose by C. Smart. EPUB, MOBI and HTML formats.
Wikisource: The Satires, Epistles & Art of Poetry of Horace, translated by John Conington. HTML and other formats.
Gutenberg: The Works of Horace. EPUB, HTML, MOBI and TXT formats.
Wikisource: Epistulae (Horatius). HTML and other formats.
Literature and History: Episode 50 - Our Brutal Age. Episode 51 - Horace and Augustan Poetry. Podcast and transcript by Doug Metzger.
Wikipedia: Horace - Epistles (Horace)
The Great Conversation: Further reading at Tom's Learning Notes
Bloom's Western Canon: The Epistles are listed.
Horace: Art of Poetry
Tibullus: Elegies - The poet is addressed by Horace in Epistle 4.
Latin resources: Learn to read Latin texts in the original.