There are several professional organizations for mechanical engineers, here are a few that you might find of interest:
- American Foundry Society
- American Society for Quality
- American Society of Mechanical Engineers
- Association for Facilities Engineering
- Fabricators and Manufacturers Association
- Institute of Electrical and Electronics Engineers
- Institute of Industrial Engineers
- Packaging Machinery Manufacturers Institute
- Precision Metal Forming Association
- Robotics Industries Association
- Society of Manufacturing Engineering
- Society of Plastics Engineers