The Bayard family has been a prominent family of lawyers and politicians throughout American history, primarily from Wilmington, Delaware. Beginning as Federalists, they joined the party of Andrew Jackson and remained leaders of the Democratic Party into the 20th century. Counting Richard Bassett, the father-in-law of James A. Bayard, Sr., the family provided six generations of U.S. Senators from Delaware, serving from 1789 until 1929.
Ann Stuyvesant Bayard, widowed wife of the French Huguenot Samuel Bayard, came to New Netherland with her brother, Director-General Peter Stuyvesant in 1647. Her grandson, another Samuel Bayard went to Bohemia Manor, Maryland in 1698. His grandson was John Bubenheim Bayard (1738–1808), Continental Congressman from Pennsylvania, and his great grandson, John Bayard's nephew, was James A. Bayard, Sr., the first Bayard in the U.S. Senate.
- Judith Bayard (c. 1615-1687), m. Peter Stuyvesant, Director-General of New Netherland
- Nicholas Bayard, sixteenth Mayor of New York City, brother-in-law of Peter Stuyvesant.
- Samuel Bayard (c. 1615-c. 1647), m. 1638, Anna Stuyvesant, sister of Peter Stuyvesant; to New Amsterdam 1647
- William Bayard (elder) (c. 1727-1804), delegate to the 1765 Stamp Act Congress and loyalist in the Revolutionary War
- William Bayard Jr. (1761–1826), New York City banker, friend to Alexander Hamilton
- James A. Bayard, Sr. (1767–1815), U.S. Senator from Delaware, m. Ann Bassett, daughter of Richard Bassett, U.S. Senator
- Richard Henry Bayard (1796–1868), U.S. Senator from Delaware
- James Asheton Bayard, Jr. (1799–1888), U.S. Senator from Delaware
- Thomas Francis Bayard, Sr. (1828–1898), U.S. Senator from Delaware
- Mabel Bayard Warren (1861–1920), married Boston attorney Samuel D. Warren
- Thomas Francis Bayard, Jr. (1868–1942), U.S. Senator from Delaware, m. Elizabeth Bradford du Pont, daughter of Alexis I. du Pont
- Alexis Irenee du Pont "Lex" Bayard (1918–1985), Lieutenant Governor of Delaware
- Edward Bayard m. Tryphena Cady, daughter of Judge Daniel Cady and sister of Elizabeth Cady Stanton. (Edward Bayard attended Union College in Schenectady, New York and studied law under his father-in-law, Daniel Cady.)
- Col. John Bubenheim Bayard (1738–1808), Continental Congressman from Pennsylvania, to Philadelphia 1755, m. Margaret Hodge, daughter of Andrew Hodge and Margaret McCulloch
- Caroline Smith Bayard (1807–1891), m. Albert Baldwin Dod (1805–1845), professor of mathematics at Princeton University
- Martha Bayard Dod (1831–1899), m. Edwin Augustus Stevens (1795–1868), founder of Stevens Institute of Technology
- Jane Bayard (1772–1851), m. Andrew Kirkpatrick (1756–1831), Chief Justice of the New Jersey Supreme Court
- Margaret Bayard (1778–1844), m. Samuel Harrison Smith
- Samuel Bayard (1767-1840), lawyer and judge
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