Ezra L'Hommedieu (August 30, 1734 – September 27, 1811) was an American lawyer and statesman from Southold, New York, in Suffolk County, Long Island.

Representing the New York City Chamber of Commerce to gain federal support, L'Hommedieu chose the site for the Montauk Point Lighthouse and designed it in 1796; it was the first to be built in the state.

He was a great-grandson of, among others, English immigrants Nathaniel and Grizzell (née Brinley) Sylvester, who had owned all of Shelter Island (8,000 acres) in the 17th century.

"[2] He became caught up in revolutionary fervor, moving from Long Island to Connecticut after occupation of the former in 1776 by the British, and aiding other refugees [clarification needed] to get to the northern shore.

Although George Washington had promised Continental aid to the refugees, L'Hommedieu spent his own money to help support them.

In the midst of a procedural stalemate in July of that year, the New York Council of Revision held that the state assembly and senate, respectively, should name candidates until both houses concurred on two nominees.

[5] He was later an unsuccessful candidate for the 1st congressional district in 1790, as well as in a separate special election for the seat earlier that year.

[6][7] Widely respected for his integrity and intelligence, L'Hommedieu represented the New York City Chamber of Commerce in discussions related to a lighthouse at Montauk Point, a federal project on which he advised President George Washington.