BONN, JAN. 10 -- New clues have surfaced suggesting that the 1986 bombing of a West Berlin discotheque may have been ordered by a convicted Arab terrorist who has been linked by a court to Syrian officials in another bombing case, a West Berlin court spokesman said today.

The new clues have come to light as West Berlin investigators for the first time have identified the person they believe planted the bomb at the crowded discotheque, a 27-year-old West German woman.

U.S. officials said the revelations could cast doubt on the Reagan administration's contention that Libya ordered the bombing.

U.S. warplanes raided Libya on April 15, 1986, in retaliation for the bombing 10 days earlier of the La Belle discotheque in which two American servicemen and a Turkish woman were killed and 204 people were injured.

The suspect in the discotheque bombing, Christine Gabriele Endrigkeit, "apparently" took orders from an Arab terrorist who is known to have worked on behalf of Syrian officials in bombing a German-Arab friendship society office a week before the discotheque attack, West Berlin court spokesman Volker Kaehne said.

An arrest warrant was issued for Endrigkeit on Dec. 30, but she is believed to be in hiding with her 3-year-old son, Kaehne said.

The Palestinian-born terrorist, Ahmed Nawaf Mansour Hasi, is serving a 14-year sentence for helping to stage the bombing of the German-Arab Friendship Society on March 29, 1986.

At his trial, the court found that some Syrian officials helped plan the attack and provided the explosives for it.

The principal Syrian suspect, Air Force intelligence Lt. Col. Haithem Saeed, also was identified as having played a major role in helping Hasi's brother, Nezar Hindawi, plan an unsuccessful attempt to blow up an Israeli airliner in London in April 1986.

"We know that Mrs. Endrigkeit apparently acted at Hasi's orders" in various matters, spokesman Kaehne said.

There were "indications" that she had acted on his orders in allegedly planting the La Belle bomb, he said.

The clues implicating Endrigkeit and Hasi included documents, among them those of Hasi, and testimony from witnesses, Kaehne said.

There was nothing made public today that would directly suggest that Syrian officials were involved in the discotheque bombing.

But a U.S. official familiar with the case acknowledged that the revelations "may raise some questions about who was sponsoring what."

The U.S. government has not altered its judgment that Libya was "involved" in the La Belle bombing, said the official, who spoke on condition that he not be identified.

"We're still sticking to our original notion that the Libyans were involved in this thing, regardless of who else this woman may be tied in with," the U.S. official said.

"It's not unusual for people involved in terrorism to have contacts with different countries," he said.

President Reagan, in announcing the bombing raid on Libya, said the United States had "conclusive" evidence that the bombing was on "direct order by the Libyan regime."

Hasi originally was arrested on suspicion of involvement in the discotheque bombing. A sketch was found in his possessions that appeared to be of the floor plan of the La Belle disco, but he has denied having any role in that attack.

Hasi confessed, however, to having helped stage the bombing of the German-Arab Friendship Society, in which seven persons were injured. Another Arab, Farouk Salameh, also confessed to that attack and is serving a 13-year sentence.

Both men are of Palestinian origin and carry Jordanian identity papers.

Hindawi and Hasi traveled to Libya in 1985, as Hindawi sought backing to form a guerrilla cell, according to testimony presented at Hasi's trial. They were rebuffed, but had better luck when they contacted Syrian agents, according to the testimony.