Sidney Gardiner (July 23, 1787 - May 1827) was an American silversmith and merchant, active in Boston and Philadelphia. His firm of Fletcher & Gardiner was nationally renowned.

Fletcher was born in Mattituck, New York. He migrated to Boston, where his family had long-standing connections. In 1803 he and Thomas Fletcher, then in their teens, formed a partnership that comprised silversmithing and selling fancy hardware at 43 Marlboro Street. In 1811 their firm of Fletcher & Gardiner moved to Philadelphia, with a shop at Third and Chestnut Street, where Gardiner worked until his death while traveling in Vera Cruz, Mexico. In 1824 he was a founding member of the Franklin Institute.

Silver by Fletcher & Gardiner is collected in the Metropolitan Museum of Art, the Harvard Art Museums, Winterthur Museum, and Yale University Art Gallery. His papers are archived in the Winterthur Museum.

References

• "Sidney Gardiner", American Silversmiths.
• Silversmiths to The Nation: Thomas Fletcher & Sidney Gardiner, 1808-1842, Donald L. Fennimore & Ann K. Wagner, Antique Collectors' Club, 2007.
• Silversmiths to the Nation: Thomas Fletcher and Sidney Gardiner, 1808–1842 2007 exhibition at the Metropolitan Museum of Art.
• "Fletcher & Gardiner", The Grove Encyclopedia of Decorative Arts.