Global Press Freedom Act This bill establishes the Office of Press Freedom to advance the protection and well-being of members of the press abroad and to engage with foreign governments and global press freedom organizations concerning freedom of the press and of expression. Led by the Ambassador-at-Large for Press Freedom, who shall be appointed by the President, the office must (1) coordinate efforts between relevant U.S. embassy personnel and press organizations or threatened individuals in situations in which press freedom is threatened abroad, (2) publicly and privately denounce oppression of the press abroad, and (3) recommend appropriate responses by the U.S. government when press freedoms are infringed upon. The office must also develop a press freedom curriculum for the National Foreign Affairs Training Center to help Foreign Service officers better understand issues of press freedom and tools that are available to help protect journalists and promote freedom of the press norms. The Government Accountability Office must assess and report on effects and changes resulting from certain requirements related to press freedom.