David L. Katz (born February 20, 1963) is an American physician, nutritionist and writer.

[7] Katz formerly served as associate director for nutrition science at the Rudd Center for Food Policy and Obesity at Yale, following his appointment in 2005.

[1] In 2000, Katz founded the Integrative Medicine Center at Griffin,[citation needed] which ceased operating in November 2014.

[12] In March 2020, Katz was invited by John Ioannidis to join in a proposed meeting intended to convince President Donald Trump not to employ lockdown measures during the COVID-19 pandemic; however, the meeting ultimately did not take place.

[4] Katz has noted that it is long established that improving diet quality can reduce the risk of chronic disease and premature death.