During in vivo gene therapy, the gene modification takes place inside the patient’s body, rather than modifying cells outside the body and then giving the cells to the patient. Our in vivo gene therapy database is a searchable and sortable list of 15 parameters for 879 trials from 2011 to 2021. The trials were collected with uniform search criteria, throughout a uniform time period, consistent with academic standards. A total of 66,867 clinical trials were searched worldwide to find the 879 trials of in vivo gene therapy.