Undated (AP) _ Romanian embassies in 13 countries today denounced the ousted regime of Romanian dictator Nicolae Ceausescu and supported the new provisional government that took power in their country.

Embassies in the Soviet Union, France, Tunisia, Jordan, Poland, Yugoslavia, Austria, Belgium, Turkey, Spain, Canada, Israel and Bangladesh all supported the popular revolt that has claimed hundreds of lives in Romania.

As fighting continued between army soldiers who sided with Romanian citizens and security forces loyal to Ceausescu, the Soviet news agency Tass said the Romanian Embassy in Moscow had sided with the provisional government.

''The entire staff of the Romanian Embassy in the Soviet Union is in full solidarity with the National Salvation Committee, the new supreme body of power in Romania, and with its platform,'' Tass said. The news agency said it had received the statement from the Romanian Embassy in Moscow.

The uprising toppled the hard-line Communist leader on Friday. The provisional government that took over promised free elections in April.

This afternoon, 30 Moscow dissidents and human rights activists gathered outside the Romanian Embassy to conduct a memorial service for the hundreds of people who have been killed in the revolt against Ceausescu.

The Romanian Embassy in France supported the provisional government, and Ambassador Petre Gigea said: ''We are completely in solidarity with the fundamental changes now going on in Romania.'' He said he was ready to meet with Romanian exiles in Paris to find the best way to help the new regime.

The Romanian Embassy in Tunis, Tunisia, took similar action. A communique signed by charge d'affaires Marin Albu proclaimed that ''all the embassy personnel are with'' the new government.

The statement said the Romanian Embassy in Jordan has taken similar action.

In Poland, Romanian Ambassador Ion Tesu stood outside his Warsaw Embassy, which had been splattered with ink by anti-Ceausescu protesters, to say he and the diplomats inside were ''in solidarity with the heroic outburst of national bravery'' under way in his homeland.

The Romanian Embassy in Yugoslavia declared that it fully supports the provisional government in Romania, the Yugoslav news agency Tanjug reported.

Press Attache Ion Makovei, speaking on behalf of Ambassador Dumitru Popa and the embassy staff in Belgrade ''strongly condemned'' Ceausescu's ''criminal actions in Romania,'' Tanjug said.

In Austria, Romanian Ambassador Trandafir Cocarla said he represented the new government of his country.

''We are very happy that our people can at last live in freedom and democracy,'' his spokesman said, adding that the embassy was now called the Romanian Embassy instead of the Embassy of the Socialist Republic of Romania.

In Brussels, Belgium, Romanian ambassador George Ciucu said: ''We express our solidarity with ... the Romanian army who are at the service of the people. The country does not need bloodshed, it has suffered enough.''

The staff of the Romanian Embassy in Ankara, Turkey, issued a statement saying: ''We, the personnel of the Romanian Embassy, declare that we are giving full support to the aims and the program of the National Salvation Committee.''

Jea Moncea, the Romanian ambassador in Spain, told Spain's national news agency EFE that the embassy in Madrid ''totally backs'' the provisional government in Romania and ''condemns'' the Ceausescu regime.

About 50 Romanian refugees demonstrated outside the Romanian Embassy in Madrid to denounce the killings in their homeland.

Romania's ambassador to Israel, Iulian Bituleanu, said his staff had also decided to support the provisional government. Earlier today, embassy workers tore the Communist emblem off the embassy gate and draped across the building a red, black and yellow Romanian flag with the Communist emblem ripped out.

''The entire staff of the Romanian Tel Aviv Embassy has joined in identifying with the people,'' Bituleanu told journalists.

The Romanian ambassador in Canada, Emilian Rodean, said he hoped the uprising achieves a ''real Romania.''

Speaking in Ottawa, Rodean said he and his staff applauded Romanians for throwing out ''the personal dictatorship regime of Ceausescu.''

He said he and the staff had not received any instructions from Romania since the hard-line Communist leader was ousted.

Luchian Petrescu, the charge d'affaires at the Romanian Embassy in Dhaka, Bangladesh, said in a statement that the embassy ''fully and firmly supports the political program of the committee of national salvation.''