This course is for those who have earned the WSET Level 3 in Wines. It is the largest course of the WSET Level 4 Diploma in Wines award.

The WSET Global Classroom D3 Diploma course focuses on the wines of the world. The course includes the Diploma D3 eBook and online activities and quizzes led by WSET. The American Wine School offers one-on-one tasting feedback online. The American Wine School also offers Virtual lectures on Zoom for select wine regions. The D3 exam is offered May and Oct of each year. The exam is given over two days in Chicago.