Although it is hard to give a unified and standardized definition to pro bono, this practice has become increasingly institutionalized worldwide. Driven by transitional legal practice, the global market for legal services, and international rule of law campaigns, pro bono work has taken place not only in developed countries (e.g., the United States, Ireland, Canada, and Austria) but also in developing countries and so-called emerging economies, such as China, India, and Brazil. The International Bar Association (IBA) has done a great deal of work to facilitate pro bono practice throughout the world. An unprecedented international pro bono initiative by the DLA Piper law firm has yielded pro bono lawyers who donated over two hundred thousand hours in 2017. Law schools also participate in this social movement. Law students who take international public interest courses in the United States apply their knowledge in a global setting. Graduates of American law schools have even begun to practice public interest law in other counties. Therefore, pro bono has become a globalized social movement accompanying legal globalization.