- J. Hunter Young Lab - Jeffery Young, M.D., M.H.S.
- J. Marie Hardwick Laboratory - J. Hardwick, Ph.D.
- J. Webster Stayman Lab - Web Stayman, Ph.D., M.S.
- James Fackler Lab - James Fackler, M.D.
- James Hamilton Lab - James Hamilton, M.D.
- James Knierim Laboratory - James Knierim, Ph.D.
- James Pekar Lab - James Pekar, Ph.D.
- James Sham Lab - James Sham, Ph.D.
- Jamie Murphy Lab - Jamie Murphy, M.D.
- Janet Record Lab - Janet Record, M.D.
- Jantzie Lab - Lauren Jantzie, Ph.D.
- Jean Kim Lab - Jean Kim, M.D., Ph.D.
- Jeanne Clark Lab: GIM Research - Jeanne Clark, M.D., M.P.H.
- Jeff Bulte Lab - Jeff W.M. Bulte, Ph.D., M.S.
- Jennifer Lee-Summers Lab - Jennifer Lee-Summers, M.D.
- Jeremy Greene Lab - Jeremy Greene, M.D., Ph.D., M.A.
- Jeremy Nathans Laboratory - Jeremy Nathans, M.D., Ph.D.
- Jeremy Sugarman Lab - Jeremy Sugarman, M.D., M.A., M.P.H.
- Jerry Spivak Lab - Jerry Spivak, M.D.
- JHU NIMH Research Center - Justin McArthur, M.B.B.S., M.P.H.
- Jinyuan Zhou Lab - Jinyuan Zhou, Ph.D.
- Joanna Peloquin Lab - Joanna Melia, M.D.
- Joanne Shay Lab - Joanne Shay, M.D.
- Jochen Steppan Lab - Jochen Steppan, M.D.
- Jodi Segal Lab - Jodi Segal, M.D., M.P.H.
- Jody Tversky Lab - Jody Tversky, M.D.
- Joel Blankson Lab - Joel Blankson, M.D., Ph.D.
- Joel Pomerantz Laboratory - Joel Pomerantz, Ph.D.
- John Aucott Lab - John Aucott, M.D.
- John Carey Lab - John Carey, M.D.
- John Matthew Austin Lab - Matt Austin, Ph.D., M.S.
- John McCloskey Lab - John McCloskey, M.D.
- John Sampson Lab - John Sampson, M.D.
- John Schroeder Lab - John Schroeder, Ph.D.
- John T. Isaacs Laboratory - John Isaacs, Ph.D.
- John Ulatowski Lab - John Ulatowski, M.D., Ph.D.
- Johns Hopkins Center for Musculoskeletal Research - Thomas Clemens, Ph.D.
- Johns Hopkins Evidence-Based Practice Center - Karen Robinson, Ph.D., M.Sc.
- Johns Hopkins Medicine Technology Innovation Center (TIC) - Paul Nagy, Ph.D.
- Johns Hopkins NIMH Center for Novel Therapeutics of HIV-associated Cognitive Disorders - Justin McArthur, M.B.B.S., M.P.H.
- Johns Hopkins University Dermatology, Allergy and Clinical Immunology (DACI) Reference Laboratory - Robert Hamilton, Ph.D., M.S.
- Johnston-Hwang Lab - Peter Johnston, M.D.
- Jon Russell Lab - Jonathon Russell, M.D.
- Jonathan Golub Lab - Jonathan Golub, Ph.D., M.P.H.
- Jonathan Jun Lab - Jonathan Jun, M.D.
- Jonathan Orens Lab - Jonathan Orens, M.D.
- Jonathan Walsh Lab - Jonathan Walsh, M.D.
- Jonathan Zenilman Lab - Jonathan Zenilman, M.D.
- Josef Coresh Lab - Josef Coresh, M.D., Ph.D.
- Joseph Carrese Lab - Joseph Carrese, M.D., M.P.H.
- Joseph Cofrancesco Jr. Lab - Joseph Cofrancesco, M.D., M.P.H.
- Joseph Mankowski Lab - Joseph L. Mankowski, D.V.M., Ph.D.
- Joseph Margolick Lab - Joseph Margolick, M.D., Ph.D.
- Jun Hua Lab - Jun Hua, Ph.D.
- Jun O. Liu Laboratory - Jun Liu, Ph.D.
- Jungsan Sohn - Jungsan Sohn, Ph.D.
- Justin Bailey Lab - Justin Bailey, M.D., Ph.D.