This document presents a survey instrument to measure the three presences that are important in online learning communities: teaching presence, social presence, and cognitive presence. The survey contains 34 questions divided into four sections - teaching presence with 13 questions, social presence with 9 questions, cognitive presence with 12 questions, and a 5 point Likert scale for responses. The survey is intended to measure students' perceptions of these three presences in their online course.