The Johns Hopkins Bloomberg School of Public Health is the public health graduate school of Johns Hopkins University, a private research university primarily based in Baltimore, Maryland.

Founded as the Johns Hopkins School of Hygiene and Public Health in 1916, the Bloomberg School is the oldest and largest school of public health in the United States. As of 2024, it claims 16% of all grants and contracts awarded to the 60 accredited schools of public health in the United States, and offers twenty-eight graduate degree programs across ten departments, included nine master's programs, two doctoral programs, and seventeen combined/dual degree programs.

The Bloomberg School is located on the Johns Hopkins medical campus in East Baltimore, adjacent to the Johns Hopkins School of Medicine, the Johns Hopkins Hospital, and the School of Nursing.

In 1913, the Rockefeller Foundation sponsored a conference on the need for public health education in the United States. Foundation officials were convinced that a new profession of public health was needed. It would be allied to medicine but also distinct, with its own identity and educational institutions. The result of deliberations between public health leaders and foundation officials was the Welch–Rose Report of 1915, which laid out the need for adequately trained public health workers, and envisioned an "institute of hygiene" for the United States. The report reflected the different preferences of the plan's two architects—William Henry Welch favored scientific research, whereas Wickliffe Rose wanted an emphasis on public health practice.

In June 1916, the executive committee of the Rockefeller Foundation approved the plan to organize an institute or school of public health at Johns Hopkins University in Baltimore, Maryland, United States. The institute was named the School of Hygiene and Public Health, indicating a compromise between those who wanted the practical public health training on the British model and those who favored basic scientific research on the German model. Welch, the first dean of the Johns Hopkins School of Medicine, also became the founding dean of the first school of public health in the United States.

The facility is located on the former Maryland Hospital site founded in 1797. The Maryland Hospital was originally built as a hospital to care for Yellow Fever for the indigent away from the city. In 1840, the hospital expanded to exclusively care for the mentally ill. In 1873, the buildings were torn down as the facility relocated to a new site as the Spring Grove Hospital Center.

On April 20, 2001, the school was renamed the Johns Hopkins Bloomberg School of Public Health in honor of businessman and Hopkins alumnus Michael Bloomberg for his financial support and commitment to the school and Johns Hopkins University. Bloomberg would later go on to serve two terms as Mayor of New York City and run a campaign in the 2020 Democratic Party presidential primaries.

The school is also the founder of Delta Omega (est. 1924), the national honorary society for graduate training in public health.

The official title of the head of the school has changed periodically between director and dean throughout the years. Originally the title was director. In 1931, it was changed to dean and in 1946 back to director. In 1958, the title again became dean. The directors and deans of the Bloomberg School include:

1. William H. Welch (1916–1927)
2. William Henry Howell (1927–1931)
3. Wade Hampton Frost (1931–1934)
4. Allen W. Freeman (1934–1937)
5. Lowell Reed (1937–1947)
6. Ernest L. Stebbins (1947–1967)
7. John C. Hume (1967–1977)
8. Donald A. Henderson (1977–1990)
9. Alfred Sommer (1990–2005)
10. Michael J. Klag (2005–2017)
11. Ellen J. MacKenzie (2017–present)

The Bloomberg School is the largest school of public health in the world, with 875 primary and 833 affiliated faculty, and 3,639 students from 97 countries. It is home to over 80 research centers and institutes with research ongoing in the U.S. and more than 60 countries worldwide. Since the U.S News and World Report began ranking school of public health in 1991, the Bloomberg School has consistently been ranked first. The school is ranked second for public health in the world by EduRank and Shanghai Rankings, behind the Harvard T.H. Chan School of Public Health.

The school offers master's degrees, doctoral degrees, postdoctoral training, and residency programs in general preventive medicine and occupational medicine. and combined and certificate training programs in various areas of public health. It is composed of 10 academic departments:

• Biochemistry and Molecular Biology
• Biostatistics
• Environmental Health and Engineering
• Epidemiology: has the largest overall postdoctoral training program in the School of Public Health. Many postdoctoral fellows and predoctoral trainees (master's level and doctoral level degree students) are supported by NIH-funded training programs. Affiliated centers and institutes include George W. Comstock Center for Public Health Research and Prevention and the Wendy Klag Center for Autism and Developmental Disabilities.
• Health, Behavior and Society
• Health Policy and Management
• International Health
• Mental Health
• Molecular Microbiology and Immunology
• Population, Family and Reproductive Health

The Bloomberg School of Public Health is located in the East Baltimore campus of the Johns Hopkins University. The campus, collectively known as the Johns Hopkins Medical Institutions (JHMI), is also home to the School of Medicine and the School of Nursing and comprises several city blocks, radiating outwards from the Billings Building of the Johns Hopkins Hospital with its historic dome. The main building on which the school is located is on North Wolfe Street; it has nine floors and features an observation area and a fitness center on the top floor. The Bloomberg School also occupies Hampton House on North Broadway. The school is also serviced by the Welch Medical Library, a central resource shared by all the schools of the Medical Campus. The campus includes the Lowell Reed Residence Hall and the Denton Cooley Recreational Center. Public transportation to and from the campus is served by the Baltimore Metro Subway, local buses, and the JHMI shuttle.

Some of the graduates of the Bloomberg School of Public Health include:

• Lolade Adeyemi, Nigerian medical doctor
• Miriam Alexander: President of the American College of Preventive Medicine
• Virginia Apgar: Apgar test, Anesthesiology, Teratology, founder of the field of neonatology
• Anna Baetjer: Physiologist known for her work on the carcinogenic effects of Chromium
• Abdullah Baqui: public health scientist
• Leroy Edgar Burney: 8th Surgeon General of the United States, first to publicly identify cigarette smoke as a cause of lung cancer
• Dr. Chen Chien-jen – Vice President of Taiwan (2016–); former Minister of Health, VP and Academician of national academic institute (Academia Sinica)
• J. Jarrett Clinton: Acting Surgeon General of the United States
• António Correia de Campos: Member of the European Parliament since 2009; Health Minister of Portugal 2001–2002, 2005–2008
• George W. Comstock: Epidemiologist, Pioneer of tuberculosis control and treatment
• Deborah J. Cotton: Emerita Professor of Medicine at the Boston University School of Medicine
• Mary Croughan: epidemiologist and provost of University of California, Davis
• Marcia Cruz-Correa: physician-scientist and gastroenterologist, member of the NCI National Cancer Advisory Board
• Dorland J. Davis: 3rd Director of the National Institute of Allergy and Infectious Diseases
• Donna M. Felling: Baltimore County nurse and member of the Maryland House of Delegates
• Sanjay Ghose: Indian rural development activist who pioneered rural community health and development media initiatives
• Donald A. Henderson: Eradication of smallpox, Presidential Medal of Freedom, former Dean 1977–1990
• Alexander Langmuir: Epidemiologist, founder of the Epidemic Intelligence Service
• Suzanne Maman: HIV/AIDS researcher
• Antonia Novello: 14th Surgeon General of the United States
• Peter Pronovost: Intensive care checklist protocol, Time 100 (2008), MacArthur Fellow
• Debbie Ricker: reproductive biologist and academic administrator
• Martha E. Rogers: Major figure in nursing theory, created the Science of Unitary Human Beings
• Bernard Roizman: Virologist, world's foremost expert on the Herpes Simplex Virus
• Linda Rosenstock: Dean of the University of California, Los Angeles School of Public Health
• Dorry Segev, Israeli-born Marjory K. and Thomas Pozefsky Professor of Surgery at Johns Hopkins University School of Medicine, Professor of Epidemiology at Johns Hopkins Bloomberg School of Public Health, and Associate Vice Chair of the Department of Surgery at Johns Hopkins Hospital
• Richard David Semba, W. Richard Green Professor of Ophthalmology at the Johns Hopkins School of Medicine
• Susan G. Sherman, epidemiologist and Bloomberg Professor of American Health in the Department of Health, Behavior and Society at Johns Hopkins University.
• Alfred Sommer: Nutrition, Discovered efficacy of Vitamin A in reducing child mortality, former Dean 1990–2005
• Paul B. Spiegel: Humanitarian health leader
• Andrew Spielman: Major figure in the modern history of public health entomology & vector-borne diseases
• John Travis: Pioneer in the Wellness movement
• Xiaobin Wang: molecular epidemiologist
• Miriam Were: African health advocate, recipient of the Légion d'honneur & the Hideyo Noguchi Africa Prize
• Melinda Wharton: Epidemiologist at the Centers for Disease Control and Prevention

• American Journal of Epidemiology
• Epidemiologic Reviews
• Progress in Community Health Partnerships: Research, Education, and Action (PCHP)
• Journal of Health Care for the Poor and Underserved
• Hopkins Bloomberg Public Health Magazine

• Official website

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