Monash University, Melbourne, Australia January 7-9, 2004 ACGRG4 is the fourth in a series of biennial conferences run by the Australasian Society for General Relativity and Gravitation (ASGRG) with the aim of bringing together researchers from around the world to discuss new findings in mathematical, theoretical, numerical and experimental gravitation, to make contacts and consolidate ideas. Where ACGRG4 will be held on the Clayton campus of Monash University. The Clayton campus is the largest of Monash University's seven campuses, and is situated about 20 km from the centre of Melbourne and 40 km from Melbourne's Tullamarine International Airport. When Conference session will last Wednesday January 7 to Friday January 9, 2004, inclusive. Registration will on Tuesday evening, January 6, and a welcome function will take place that evening. A one day excursion is planned for Saturday January 10. Costs Registration fee will be AUS$250 and AUS$150 for students. For ASGRG members the fees will be AUS$190 and AUS$120 for students. The conference dinner, Thursday Jan 8, will be a short walk from the conference centre and will cost AUS$50 and AUS$30 for students. There will a one day excursion on Saturday Jan 10 to the premier vineyards of Victoria, the Yarra Valley. The cost will be AUS$70. This will include wine tasting and a full 3 course meal at one of the leading vineyards. Sessions There will be invited talks in the morning followed by two parallel sessions in the afternoon. Speakers in the parallel sessions will have 20 minutes to present their work plus time for questions. We hope to provide all who wish to speak an opportunity to do so. Proceedings The conference proceedings will be refereed and published.