This document summarizes the results of a survey on fast food usage and favorite fast food brands in Vietnam. It finds that 71% of respondents like or really like fast food, with 47% using fast food regularly. Males and younger people tend to use fast food more frequently. The most common occasion for fast food is hanging out with friends. KFC and Lotteria are the most frequently used chains, seen as having reasonable prices, good locations, and promotions. McDonald's is seen as more expensive. The survey involved 476 respondents aged 18-39 in Ho Chi Minh City in April 2016.