Kentarō Iwata

is a Japanese physician, professor and infectious diseases expert at Kobe University.

Career After his graduation from the Shimane Medical University (present-day Medical Faculty of Shimane University) in 1997, Iwata became a medical intern worked at . In the next year, he became a medical intern worked at St. Luke's Roosevelt Hospital of Columbia University. In videos, he described the conditions of quarantined Diamond Princess as "completely chaotic", and called the ship a "COVID-19 mill". Iwata briefly gained physical access to the ship, saying he observed no infection control measures in place. After being "kicked off" the ship after and then voluntarily quarantining himself, he stated "we have to do something about this cruise. We have to help people inside the ship." On 20 February, he deleted the videos himself, and said "there is no need for further discussing this". He also denied he had been pressured to delete the videos.

In April 2020 he expressed pessimism that the Olympics could be held in 2021.