Encyclopædia Britannica: Herrick, Robert (1591-1674): Biographical article from the 1911 edition. Has a few scanner errors.
Robert Herrick: Biography, portrait, and selected poems.
Robert Herrick (1591-1674): "Robert Herrick, seventeenth century cavalier, poet and son of Ben." Webpages devoted to Herrick at luminarium.org.
Robert Herrick (poet): Short biographical essay, with hyperlinks to related topics.