board of directors; board of trustees
Refers to the governing body of an organization, such as a company, school, or non-profit. The exact English term depends on the type of organization.
The new policy is scheduled to be decided at next month's board meeting.
He is a member of the university's board of trustees.
理事会 specifically refers to a board of directors/trustees with governing authority, while 委員会 is used more widely for committees of any kind.
Compound of 理事 (director, trustee) and 会 (meeting, association).