The Best of COSEE Hands-On Activities offers ocean scientists simple, engaging, and easily accessible hands-on activities that will make your presentations to K-12 students, the public, or other non-science audiences more effective. This collection is brought to you by the Centers for Ocean Science Education Excellence (COSEE), a Network of Centers and a National Office that is now entering its 10th year of funding from the National Science Foundation Division of Ocean Sciences. This collection was gathered from across the COSEE Network, with each Center submitting their best hands-on activities. We hope that by using the Best of COSEE Hands-On Activities collection you will be inspired to continue and perhaps expand your efforts in Education and Outreach.