The Office for Strengthening Unity (also Office for Consolidating Unity, Persian: دفتر تحکیم وحدت‎‎, Daftar-e Tahkim-e Vahdat), is an Iranian student organization created in 1979, and has been described as "the country's most well-known student organization," and "Iran's leading prodemocracy student group". Founded in 1979 as a conservative Islamist organization to combat leftist, more secular, student groups, the OSU has evolved to support democracy and reform in Iran and thus is now in opposition to the political heirs of its founders.