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Terry Anderson, the American journalist who had been the longest-held Western hostage in Lebanon when he was finally released in 1991 by Islamic militants after more than six years in captivity, died on Saturday at his home in Greenwood Lake, N.Y., in the Hudson Valley. He was 76.

The cause was apparently complications of recent heart surgery, his daughter Sulome Anderson said.

Mr. Anderson, the Beirut bureau chief for The Associated Press, had just dropped his tennis partner, an A.P. photographer, at his home after an early morning tennis match on March 16, 1985, when men armed with pistols yanked open his car door and shoved him into a Mercedes-Benz. The same car had tried to cut him off the day before as he returned to work from lunch at his seaside apartment.

The kidnappers, identified as Shia Hezbollah militants of the Islamic Jihad Organization in Lebanon, beat him, blindfolded him and kept him chained in some 20 hideaways for 2,454 days in Beirut, South Lebanon and the Bekaa Valley.

The militants, supported by Iran, indicated that they were retaliating against Israel’s use of American weapons in earlier strikes against Muslim and Druze targets in Lebanon. They had also been seeking to pressure the Reagan administration to secretly facilitate the illegal sales of weapons to Iran — an embarrassing scheme that became known as the Iran-contra affair because the administration had planned to use proceeds from the arms sales to secretly subsidize the right-wing contra rebels in Nicaragua.

Mr. Anderson was the last of 18 Western hostages released by the kidnappers. After he was freed, he married his fiancé, Madeleine Bassil, who had been pregnant when he was kidnapped, and, for the first time, met his 6-year-old daughter.

While he had not been tortured during his captivity, he said, he was beaten and chained. He spent a year or so, on and off, in solitary confinement, he said.