This course will review the basic principles of marine optics, describe the current state of the art in marine imaging, and present future directions in optics for port and harbor security. It will also describe some of the real-world threats already encountered in port security. The marine-optics review will include effects of waves and subsurface effects on imaging underwater and seeing through the sea surface. The current state of the art section will describe active and passive sensors, including lidar, hyperspectral, and multispectral systems, with emphasis on proven technologies for mine countermeasures (MCM). The course will address some of the issues related to adapting military technology for civilian harbor and port defense.