WASHINGTON (AP) _ The World Press Freedom Committee on Tuesday urged all organizations hoping to foster a free press in Eastern Europe to coordinate their efforts through a meeting next October.

''An entirely new dimension of needs and opportunities faces all of us,'' said Harold W. Andersen, chairman of the committee and former publisher of the Omaha World-Herald Company. ''We all need to know what is being done - and not being done.''

He urged interested organizations to take part in a one-day conference at the National Press Club in Washington on Oct. 10.

The 14-year-old committee, which represents 33 national and international news organizations from five continents, has already surveyed the media of Eastern Europe and has prepared a list of possible projects.

It also has published a ''Handbook for Journalists of Central and Eastern Europe'' and is serving as a clearing house for media organizations to match needs and resources.

''A substantial number of people and organizations, both public and private, are trying to help,'' said Anderson. ''We need to share information as to who is doing what. This should help all parties avoid duplication and cooperate more freely.''

He said the committee wanted participation from every organization already helping East European media or even thinking about it and urged them to contact the committee's Washington office.

---

The commitee's address is: The World Press Freedom Committee, care of The Newspaper Center, P.O. Box 17407, Washington, D.C. 20041. Telephone: (703) 648-1000; Fax: (703) 620-4557; Telex: 292810.