Amos Richards Eno (November 1, 1810 – February 21, 1898) was an American real estate investor and capitalist in New York City. He built the Fifth Avenue Hotel and many other developments on the streets of Broadway and Fifth Avenue, where he established a prominent family fortune of 20 to 40 million U.S dollars.
Amos Richards Eno was born November 1, 1810 in Simsbury, Connecticut.
He married Lucy Jane Phelps. Their children included: Amos F. Eno, Mary Eno (who married James W. Pinchot), William Phelps Eno, Henry C. Eno, John Chester Eno, and Antoinette Eno.
Amos R. Eno began his career as a merchant of dry goods who expanded into real estate in New York City having built the Fifth Avenue Hotel in New York City and much valuable real estate in New York City where he established a prominent family fortune. Having clerked in a small general store in Hartford, Connecticut, he married Lucy Phelps, also of Simsbury, and moved to New York, where he and his cousin John Jay Phelps opened a profitable dry goods business. While making a fortune in the dry goods business, Amos Eno parlayed his profits into real estate investment in Manhattan, New York, buying corner lots and occasionally full undeveloped city blocks. His brownstone-fronted store at 74 Broadway had the reputation of having been the first use of brownstone in the city. Retiring from active participation as a merchant, he concentrated in 1856–59 in building the famous Fifth Avenue Hotel at the corner of Fifth Avenue and 23rd Street in Madison Square, Manhattan, and the adjacent Madison Square Theatre in 1863. North of the Square he built a brick four-storey house at 233 Fifth Avenue that served as his residence for many years, then from 1890 housed the Reform Club of New York, recently (1888) founded by Anson Phelps Stokes. He and relatives established the Second National Bank of New York, headquartered in the hotel. In 1884 scandal hit the family bank when one of Amos' sons, John Chester Eno, president of the bank, embezzled millions of dollars and then fled to Canada to avoid prosecution. Eno never closed the bank, though three to four million dollars were withdrawn in panic, and made good his son's embezzlement, "though he never recovered from the shock". He held the greater part of a full block facing Broadway in Longacre Square (now Times Square). His last real estate speculations were in open lots in the Upper West Side.