Tom Clancy Defense Protocol is the 25th novel in the bestselling Jack Ryan series, written by Brian Andrews and Jeffrey Wilson and published by G.P. Putnam's Sons. In this military thriller, Chinese President Li Jian Jun devises a secret military operation to take Taiwan, and only Minister of Defense Qin Haiyu knows how to stop his plan for reunification. John Clark creates an international task force reminiscent of Rainbow Six and goes undercover in mainland China, while Lt. Commander Katie Ryan is deployed on the destroyer USS Jason Dunham to defend Taiwan.

The hardcover edition is 512 pages (ISBN: 9780593717974), first published December 3, 2024, with a mass market paperback edition releasing October 28, 2025 at 560 pages.