The Queensland Gay Community Periodic Survey is a cross-sectional survey of gay and homosexually active men recruited through a range of gay community sites in Queensland. The project was funded by Queensland Health. The Periodic Survey provides a snapshot of sexual and HIV-related practices among gay men and other homosexually active men. This is the fourth time the survey has been conducted in Queensland. Data from this survey can be used to make comparisons with the three previous surveys conducted in 1998, 1999, and 2000.