Internships › Mechanical Engineering › California
Mechanical Engineering internships in California
109 open student roles in mechanical engineering in California, from internships to co-ops and research. That includes 12 co-ops and 1 part-time role. 11% list pay or say they are paid. The most common start terms are Summer 2027 and Spring 2027. Employers with the most openings: Astranis, Edison International, Rocket Lab, Marathon Petroleum and AeroVironment.
Rank these for your major and year- TerranovaMechanical/Test Engineering InternOpen posting
- Manufacturing Engineering InternOpen posting
- Astranis NewThermal Intern (Winter 2027)Open posting
- Astranis NewThermal Intern (Summer 2027)Open posting
- Reflect Orbital NewMechanical Engineering InternOpen posting
- Intern/Co-op - Midstream Logistics and Storage Mechanical/Civil/Electrical Engineering (Spring 2027)Open posting
- iRhythm Technologies NewLifecycle Engineering Co-Op Full Time Intern Jan-June 2027Open posting
- iRhythm Technologies NewMechanical Engineering Co-op Full Time Intern Jan - June 2027Open posting
- Intern/Co-op - Midstream Logistics and Storage Mechanical/Civil/Electrical Engineering (Fall 2027)Open posting
- Intern/Co-op - Midstream Logistics and Storage Mechanical/Civil/Electrical Engineering (Summer 2027)Open posting
- Bracket Bot NewAdvanced 3D Printing Mechanical Engineering InternOpen posting
- Amgen NewUndergrad Co-op – MCS Manufacturing AssociateOpen posting
- VITAL LYFE NewMechanical Engineering Internship - Spring 2027Open posting
- Rocket Lab NewThermal Engineering Intern Summer 2027Open posting
- Rocket Lab NewThermal Engineering Intern Spring 2027Open posting
- Mechanical Engineering Intern (Summer 2027)Open posting
- AeroVironment NewAeromechanical Engineering InternOpen posting
- Harness Manufacturing Intern (Summer 2027)Open posting
- Propulsion Manufacturing Intern (Summer 2027)Open posting
- Propulsion Manufacturing Intern (Winter 2027)Open posting
- Space Mechanical Design Engineering Intern - Summer 2027Open posting
- Mechanical Engineering Internship – Summer 2027Open posting
- Manufacturing Engineering Intern Spring 2027Open posting
- Test Engineering Intern - Manufacturing Spring 2027Open posting
- Mechanical Engineer InternOpen posting
- Manufacturing Engineering Intern Summer 2027Open posting
- Intern - PDM - Manufacturing Strategy & OperationsOpen posting
- Intern - PDM - Manufacturing (Biologics)Open posting
- Internship - Metrology in battery manufacturing (f/m/x)Open posting
- SensataMechanical Engineer Intern (Aerospace) - Summer 2027Open posting
- 1XInternship - Manufacturing EngineeringOpen posting
- Manufacturing Engineering Intern - Summer 2027Open posting
- Mechanical Engineering Intern Summer 2027Open posting
- Mechanical Engineering Intern Spring 2027Open posting
- Mechanical Engineering Design Intern - Summer 2027Open posting
- Continuous Improvement Manufacturing InternshipOpen posting
- Additive Manufacturing Intern Summer 2027Open posting
- Additive Manufacturing Intern Spring 2027Open posting
- Pacific FusionSummer 2027 Internship- Mechanical EngineeringOpen posting
- Pacific FusionSummer 2027 Internship-Manufacturing EngineeringOpen posting
Showing the 40 newest of 109. See every one on the dashboard, ranked for your profile.
Get new ones in a Discord or Slack channel, or a feed reader: RSS feed
Applying to a few? The free Auto-Apply extension fills in the application for you and stops at the submit button.
Mechanical Engineering internships in other states
Updated September 26, 2026. Listings are collected from public job boards several times a day; always check the posting on the employer's site before applying.