This document summarizes the application, website, and mobile advertising market trends in Vietnam from 2013-2015. It finds that online advertising revenue grew significantly over this period, reaching $42 million USD in 2013, with most mobile advertising revenue generated through over-the-top mobile messaging applications. Popular video sites in Vietnam include YouTube, VnExpress, and Clip.vn. The document also reviews the main local and international mobile app stores and advertising networks active in Vietnam during this period.