Some romantic poems about love that would be appropriate for a wedding include William Shakespeare's "Sonnet 116" (published in 1609), Anne Bradstreet's "To My Dear and Loving Husband" (1677), and a more modern poem, Jane Hirshfield's "A Blessing for a Wedding" (2011). Another choice is the poem that British newspaper The Telegraph called the "most romantic poem in English literature": Lord Byron's "She Walks in Beauty."
The website Poets.org has a section dedicated to poems suitable for a wedding. Its suggestions span over 400 years of poetry, beginning with Edmund Spenser's poem "Epithalamion," published in 1594.
Another website, PoetryPoundation.org, suggests several poems on classic or romantic love that would work well for a wedding. These include two more of Shakespeare's sonnets: "Sonnet 40" ("take all my loves, my love, yea, take them all") and Sonnet 65.
If something more modern is preferred, the site suggests Peter Gizzi's poem "Lines Depicting Simple Happiness" or "Flirtation" by Rita Dove.
The famous Pre-Raphaelite poet Christina Rossetti wrote the poem "I Loved You First: But Afterwards Your Love." Rossetti was known for her romantic poems, and this one details the fluid, symbiotic love between two people, a perfect sentiment for a happy wedding day.