The Saint Thomas More Society, Sacramento serves as a professional organization dedicated to fostering ethical practice within the legal community. Since its establishment in 1987, STMS has provided a structured platform for attorneys, legal professionals, and legislative advocates to connect, grow, and uphold the highest standards of civility and ethics in law practice. Based in Sacramento, CA, the organization welcomes legal professionals of all religious backgrounds who are committed to its core mission.

STMS operates as an independent organization sponsored by Catholic lawyers and governed by an elected Board. The society functions as a mutual support group while promoting individual spiritual development and interfaith understanding among members. A key focus is advancing the principles of the Second Vatican Council and modeling respect, civility, and ethical conduct within the legal profession. The organization actively contributes to the Sacramento legal community through meaningful participation in Sacramento County Bar Association events, including the annual Bench-Bar Reception, District Attorney Candidates' Forum, and various membership functions.

The membership base extends beyond attorneys to include paralegals, legal secretaries, judges, clerks, lobbyists, legislative advocates, government workers, and law students. STMS maintains a commitment to professional development and community engagement without engaging in political advocacy or controversial political positioning. As an affiliate of the Sacramento County Bar Association since 2005, STMS continues to serve as a respected voice for professional excellence and ethical practice in the Sacramento legal landscape.