If President Reagan feels an affinity for "Rambo," Sen. Ted Kennedy clearly views himself more like prizefighter "Rocky." Now down to fighting weight, Kennedy appeared at the office Christmas party yesterday wearing boxing gloves and posing as Rocky, according to several partygoers.

However, the senator apparently doesn't want his antics known. Asked to verify his performance, press secretary Melody Miller said the party was "completely off the record . . . so we can have the opportunity to have fun." Women Make Jaycees' Top 10

The U.S. Jaycees yesterday announced its list of "Ten Outstanding Young Americans," which for the first time includes women. The Jaycees has recognized the "Ten Outstanding Young Men of America" since 1938. Last year, the U.S. Supreme Court ruled unconstitutional the Jaycees' bylaws that limited membership to men.

Chosen for the 1986 honors were Jan Scruggs of Columbia, Md., who was instrumental in the construction of the Vietnam Veterans Memorial; Bob Welsh, a Los Angeles Dodgers pitcher who overcame alcohol addiction; Atlanta businessman Michael Hollis; social activist and Michigan state Rep. Debbie Stabenow; Missouri Secretary of State Roy Blunt; Minneapolis systems programmer Curtis Chong; Orlando, Fla., City Commissioner Glenda Hood; Minnesota clergyman Charles Murr; New York University law professor Nadine Strossen; and Iowa good Samaritan and printer David Steiner. A Successful Lifesaving Maneuver

Television sportscaster Warner Wolf used the Heimlich maneuver Thursday to save Frank Field, the weatherman and science reporter who helped popularize the maneuver, a technique to dislodge food from the windpipe.

The two newscasters were eating at a New York restaurant around 7:30 p.m. when Field suddenly inhaled part of a roast beef sandwich. "I was choking. I couldn't say a word," Field said later. "I thought, 'My God, I'm the guy that talked about all this and I am going to die?' "

Wolf, who learned the lifesaving technique from Field when he demonstrated it while working at WNBC-TV, got behind Field, reached around and put his fist on his solar plexus and squeezed. The roast beef popped out.

The two then went on WCBS-TV's 11 p.m. news. Field thanked Wolf on the air for saving his life, sheepishly admitting that he shouldn't have been talking with his mouth full. End Notes

Canadian Ambassador Allan Gotlieb and his wife Sondra celebrated their fourth year in Washington last night with a black-tie dinner at their residence. The guest list included Attorney General Ed Meese and his wife Ursula, Sen. Ernest Hollings, Sen. Patrick Leahy, Sen. Dave Durenberger, new national security affairs adviser John Poindexter, AFL-CIO President Lane Kirkland, gallery directors Laughlin and Jennifer Phillips and USIA director Charles Z. Wick . . .

Actress Jessica Tandy, who collapsed on a Los Angeles stage Tuesday night and spent two days in a hospital for exhaustion, rejoined her husband Hume Cronyn for last night's performance of "Foxfire," a spokesman said. Tandy, 76, collapsed midway through the first act and was taken to the hospital. She was released Thursday afternoon, theater spokesman Jon Tilley said . . .

Ken Taylor, the former Canadian ambassador who rescued six Americans in Iran, yesterday became a permanent resident of the United States. At a ceremony in New York, U.S. Immigration officials gave Taylor a "green card" permitting him to live and work in the United States. He said he had no plans to give up his Canadian citizenship. Taylor was Canada's ambassador in Tehran in November 1979, when Iranian militants seized the U.S. Embassy. Taylor hid six American diplomats for three months in the Canadian Embassy. He now works for the Nabisco company in New York . . .