The 2016 IMSA SportsCar Championship (known for sponsorship reasons as the 2016 IMSA WeatherTech SportsCar Championship) was the third season of the United SportsCar Championship and first to be under the name as the IMSA SportsCar Championship organized by the International Motor Sports Association (IMSA). It was the 46th season of IMSA-sanctioned GT Championship sportscar racing tracing its lineage to the 1971 IMSA Camel GT season. It began on January 30 with the 24 Hours of Daytona and ended on October 1 at Petit Le Mans.

The class structure remained largely unchanged from 2015, with the major change coming in GTD which was now run full GT3 spec machinery.

The 2016 schedule was released on August 8, 2015 and features twelve rounds.

There were also two test sessions before the beginning of the season. They were held on November 17–18 at Daytona International Speedway, as well as The Roar Before the 24, also at Daytona, January 8–10.

NOTE: Because of a high car count for the Mazda Raceway event, there will be two separate two-hour races with two categories racing in each race.

All entries use an Oreca FLM09 chassis powered by a Chevrolet LS3 6.2 L V8.

Bold indicates overall winner.

Championship points are awarded in each class at the finish of each event. Points are awarded based on finishing positions as shown in the chart below.