Nine regular cast members received Emmy nominations for The West Wing’s 2001–2002 season.
The nominees were Martin Sheen, Richard Schiff, Dulé Hill, Bradley Whitford, Allison Janney, John Spencer, Stockard Channing, Janel Moloney, and Mary-Louise Parker. They represented the lead and supporting acting categories, reflecting how broadly the ensemble was recognized that year.
Three performers were also nominated as guest actors: Mark Harmon, Tim Matheson, and Ron Silver. Including those guest nominations produces a larger total of 12 acting nominations, which is why some summaries give a different number.
The season was especially successful at the ceremony. Janney won Outstanding Lead Actress, while Spencer won Supporting Actor and Channing won Supporting Actress. The question specifies regular cast members, so nine—not 12—is the appropriate answer.