Engineers & Scientists of California Local 20, also known as ESC Local 20, is a prominent and dynamic union that represents nearly 8,000 licensed engineers, scientists, licensed healthcare professionals, and attorneys. Operating in Northern California, they advocate for the rights and interests of their members through collective bargaining. ESC Local 20 is unique as it combines the collective bargaining strength of a union with the autonomy and specialization of a professional association. Their mission is also to raise the standards for professional and technical employees, ensuring they have equal standing with their employers.

ESC Local 20 is affiliated with the International Federation of Professional and Technical Engineers (IFPTE), a well-established union that represents professional employees across various sectors. This affiliation provides ESC Local 20 with added support and resources. Ultimately, ESC Local 20 is a member-driven union that strives for a problem-solving relationship with employers while working towards the betterment of professional employees' lives and careers.