The Boston Public Library is one of the most iconic wedding venues in New England — but booking it takes planning, and the costs can surprise you. This guide breaks down pricing across every space, how far in advance you need to book, and a little-known $200 micro-ceremony option in the stunning Guastavino Room. Whether you're dreaming of a grand 300-person reception in Bates Hall or an intimate elopement with 12 guests, here's everything you need to know before you reach out.