John Davis Porcari (born December 14, 1958) is an American government official and businessman who served as United States deputy secretary of transportation and Port Envoy to the White House Supply Chain Disruptions Task Force.

Serving as deputy to Secretaries Ray LaHood and Anthony Foxx, Porcari was instrumental in implementing department programs, including over $3 billion in Transportation Investment Generating Economic Recovery (TIGER) grants (originating from the American Recovery and Reinvestment Act of 2009) and USDOT's stringent Buy America Act provisions, in place to ensure transportation projects are built by American workers using domestic materials.

In addition to serving as operations officer over USDOT's more than 55,000 employees, Deputy Secretary Porcari oversaw resolution on an array of programs and issues, including the vehicle return/rebate program Cash-for-Clunkers, Toyota's recall of 2.3 million vehicles due to unexpected acceleration, and implementation of the Congressional transportation legislation Moving Ahead for Progress in the 21st Century (MAP-21).

As Deputy Secretary, Porcari has testified before Congress on multiple occasions, including seven hearings since January 2012 alone, on matters involving project delivery, the Next Generation Air Transportation System, drawdown from the Strategic Petroleum Reserve, aviation and global positioning system coordination, and rebuilding in the aftermath of Hurricane Sandy.

Porcari's signature achievements at USDOT included implementation of President Obama's Executive Order 13604, an Administration effort to expedite project permitting, while delivering quality environmental outcomes.