WESTPORT, Conn.—Paul Newman, the Oscar-winning superstar who personified cool as the anti-hero of such films as “Hud,” “Cool Hand Luke” and “The Color of Money”—followed by a second act as an activist, race car driver and popcorn impresario—has died. He was 83.

Newman died Friday at his farmhouse near Westport following a long battle with cancer, publicist Jeff Sanderson said. He was surrounded by his family and close friends.

In May, Newman dropped plans to direct a fall production of “Of Mice and Men” at Connecticut’s Westport Country Playhouse, citing unspecified health issues. The following month, a friend disclosed that he was being treated for cancer and Martha Stewart, also a friend, posted photos on her Web site of Newman looking gaunt at a charity luncheon.

But true to his fiercely private nature, Newman remained cagey about his condition, reacting to reports that he had lung cancer with a statement saying only that he was “doing nicely.”

As an actor, Newman got his start in theater and on television during the 1950s, and went on to become one of the world’s most enduring and popular film stars, a legend held in awe by his peers. He was nominated for Academy Awards 10 times, winning one Oscar and two honorary ones, and had major roles in more than 50 motion pictures, including “Exodus,” “Butch Cassidy and the Sundance Kid,” “The Verdict,” “The Sting” and “Absence of Malice.”

Newman worked with some of the greatest directors of the past half century, from Alfred Hitchcock and John Huston to Robert Altman, Martin Scorsese and the Coen brothers. His co-stars included Elizabeth Taylor, Lauren Bacall, Tom Cruise, Tom Hanks and, most famously, Robert Redford, his sidekick in “Butch Cassidy” and “The Sting.”

With his strong, classically handsome face and piercing blue eyes, Newman was a heartthrob just as likely to play against his looks, becoming a favorite with critics for his convincing portrayals of rebels, tough guys and losers. New York Times critic Caryn James wrote after his turn as the town curmudgeon in 1995’s “Nobody’s Fool” that “you never stop to wonder how a guy as good-looking as Paul Newman ended up this way.”

“Sometimes God makes perfect people,” fellow “Absence of Malice” star Sally Field said, “and Paul Newman was one of them.”

In the 1970s, Newman, admittedly bored with acting, became fascinated with auto racing, a sport he studied when he starred in the 1969 film, “Winning.” After turning professional in 1977, Newman and his driving team made strong showings in several major races, including fifth place in Daytona in 1977 and second place in the Le Mans in 1979.

In 1982, Newman and his Westport neighbor, writer A.E. Hotchner, started a company to market Newman’s original oil-and-vinegar dressing. Newman’s Own, which began as a joke, grew into a multimillion-dollar business selling popcorn, salad dressing, spaghetti sauce and other foods. All of the company’s profits are donated to charities. By 2007, the company had donated more than $175 million, according to its Web site.

Newman is survived by his wife, five children, two grandsons and his older brother Arthur.