Abstract: A Petri dish bioreactor can allow a standard Petri dish to be converted to a microscopically observable bioreactor. A bioreactor can be formed by the compression of a device against the edge of a Petri dish thus creating a sealed isolated chamber. One advantage of this conversion is to provide an inexpensive device that can be used for cell culture, observation, transportation, and storage in the laboratory and clinical setting. Further, by creating a sealed bioreactor chamber accessible by ports, the device can reduce cross contamination and allow for the maintenance of a controlled microenvironment within the bioreactor.