Formal Methods Pacific '97 is an umbrella conference, incorporating the 6th Australasian Refinement Workshop and the 3rd New Zealand Formal Program Development Colloquium. The conference provided a forum for discussion of current research on mathematicallybased techniques for design and development of computer systems, especially formal and/or rigorous methods for developing executable programs from abstract specifications, tool support for formal software development, and practical experience with formal methods. Topics also include software specification and verification, hardware specification and verification, and specification and development of real-time and concurrent systems. The refereed papers included in these proceedings present significant contributions to current research in formal software development within Australasia, along with several contributions from other parts of the world. The conference also included informal presentations describing work in progress; abstracts only for these are included.