National Manufacturing Advisory Council for the 21st Century Act This bill establishes through September 30, 2025, the National Manufacturing Advisory Council within the Department of Commerce to support the U.S. manufacturing sector. The duties of the council shall include (1) providing advice and recommendations to Commerce regarding issues that involve U.S. manufacturing; (2) conveying input from key industry, labor, academic, defense, governmental, and other stakeholders to aid in the development of a national strategic plan for U.S. manufacturing; (3) monitoring global manufacturing trends and global threats to the U.S. manufacturing sector; and (4) providing input and improvements to the manufacturing.gov website.