Public Heath in Humanitarian Crises is an online course offered by Johns Hopkins University. This 5-week course introduces individuals to the public health problems experienced by those affected by natural disasters and/or conflict, such as war. In addition, this course explores both the theoretical knowledge of and practical examples of humanitarian interventions that can be used to mitigate the effects of these disasters. This beginner level course consists of 10 modules, with 9-10 hours of delivered content, in addition to 2-3 hours of quizzes, writing and evaluating a short peer reviewed assignment, and participation in discussion forums. Topics covered in these modules include water and sanitation, food security, nutrition, management of diseases during crises, health care during humanitarian emergencies, shelter, protection of displaced population, emerging risks, challenges, and opportunities for future emergencies. Those who pass all graded assignments will complete the course.