This is the second and final round of MSM behavioral surveys supported by the USAID Social Marketing for HIV Prevention Project, implemented by PSI Vietnam. The 2011 MSM Behavioral Survey (Round 1) was conducted in 5 provinces: Hanoi, Hai Phong, HCM, Can Tho, and An Giang. Results were used to inform MSM-targeted HIV prevention programming across projects and partners. The FY13 MSM Behavioral Survey is conducted in the same five provinces covered in 2011. Data was collected using a structured questionnaire, estimated to take 40-45 minutes to complete. RDSAT was used to adjust estimates