Distributed Database Management system is a need of the hour. The concurrent transactions are not only important in any Data Base Management System but are also important in Distributed DBMS. For the data to be in consistent state in the database, various concurrency control protocols are developed and are in use. Every protocol has it’s own advantagesand limitations, depending upon the application, type of data and the way it is distributed, the protocols are used. The following paper suggests a protocol : “Cluster Co-ordinator protocol ” for concurrency control. The protocol uses a co-ordinator for the group or cluster of sites responsible for locking of the data in that cluster. The locking requests would be mainly between co-ordinators thus reducing the data traffic.