The **China Girls Mathematical Olympiad (CGMO)** is an international, proof-based mathematics competition for female high school students. Founded in 2002, it is held annually in China and typically hosted by a leading secondary school or university in cooperation with the **China Mathematical Society** and regional education authorities. Teams from across China and invited countries (such as the USA, Russia, and others) take part. Participants are usually selected by their home countries' or regions' national math olympiad programs. The contest consists of rigorous, Olympiad-style problems that require written proofs over multiple exam sessions, similar in format and difficulty to national and international math olympiads. Beyond medals and awards, students benefit from advanced problem-solving experience, exposure to international peers, and mentorship from experienced coaches and mathematicians, all in a setting that supports and promotes girls in mathematics. Because invitations and selection are handled locally, interested students typically prepare by participating in their national mathematical olympiad training programs and in related competitions, then seek nomination through their country’s mathematical association or olympiad committee.