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EOS - European Optical society
The purpose of the EOS is to contribute to the scientific progress in Optics and related sciences and to promote their applications on the European and international levels, by bringing together individual persons and legal bodies involved in these disciplines and their applications.
Fibreoptic Industry Association (representing cable installers, component suppliers and training providers)
Laser Insitute of America 
Promotes all aspects of the enginering applications of lasers, particularly cutting, welding, surface treatments, cleaning, forming, fast freeform fabrication. Significant programmes for the promotion of technology transfer and inward investment in laser manufacturing applications.
LEOS: Lasers and Electro Optics Society 
LEOS is chartered by the IEEE with the mission of being the leading organization in the areas of lasers and other electro-optical devices and their system applications. The field of interest of the society is lasers, optical devices, optical fibers, and associated lightwave technology and their applications in systems and subsystems in which quantum electronic devices are key elements. The society is concerned with the research, development, design, manufacture, and applications of materials, devices, and systems, and with the various scientific and technological activities which contribute to the useful expansion of the field of quantum electronics and applications.
Photonics resources for Scientists and Engineers. Optics industry resources. Technical Library, Optical Standards, Patent research, Events and conferences, Buyer's guide.
OSA (Optical Society of America)
The Optical Society of America was organized to increase and diffuse the knowledge of optics, pure and applied, to promote the common interests of investigators of optical problems, of designers, and of users of optical apparatus of all kinds; and to encourage cooperation among them. The purposes of the corporation are scientific, technical, and educational.
The Fiber Optic Association  
International non-profit professional association for the fibre optic industry
SPIE - The International Society for Optical Engineering 
The Society's fundamental mission is to provide world-class education and information services that enhance and promote the profession and field of optical engineering and that add quality and value to the careers of the members it serves. Publications, Conferences and exhibitions, Technical Groups, Standards,  Photonics gateway,etc
A career website for optics, photonics, and imaging professionals. 
Services: resume/CV postings, job alerts, job postings, a Technical Library, and a searchable company database. Employers may post jobs for a fee.