国际文凭组织（International Baccalaureate Organization）是一个非牟利性质的国际教育基金会，成立于1968年，总部设在瑞士的日内瓦，在新加坡、布宜诺斯艾利斯和纽约分别设有办事处。国际文凭组织面向全世界的儿童和青少年提供四个国际文凭教育项目：小学项目（PYP）、中学项目（MYP）、大学预科项目（DP）和IBCC。在2009年2月，全世界有134个国家地区的2572所学校、超过69.8万学生采用了这些教育项目。国际文凭组织的课程与评估中心（IBCA）设在英国的加的夫。

The International Baccalaureate (IB), formerly known as The International Baccalaureate Organization (IBO), is an international educational foundation headquartered in Geneva, Switzerland, founded in 1968. IB offers four educational programmes for children aged 3–19. The organization's name and logo were changed in 2007 to reflect a reorganisation. Consequently, "IB" can refer to the organisation itself, any of the four programmes, or the diploma or certificates awarded at the end of the programme.