The Fourth Degree is the highest degree of the order. Members of this degree are addressed as "Sir Knight". The primary purpose of the Fourth Degree is to foster the spirit of patriotism and to encourage active Catholic citizenship. Fewer than 20% of Knights join the Fourth Degree, which is optional. A Knight must be active in his council for one year before he can join a Fourth Degree Assembly.

Assemblies are distinct from councils and are led by a separate set of elected officers. The Supreme Board of Directors appoints a Supreme Master, and  Vice Supreme Masters to govern the Fourth Degree. Each Vice Supreme Master oversees a Province which is then broken up into Districts. The Supreme Master appoints District Masters to supervise several assemblies.

Each assembly is led by a Navigator. Other elected assembly officers include the Captain, Admiral, Pilot, Scribe, Purser, Comptroller, Sentinels and Trustees. A Friar and Color Corps Commander are appointed by the Navigator. Assembly officers are properly addressed by using the title "faithful" (e.g. Faithful Navigator). Assemblies are numbered in the order in which they chartered into the Order and are named by the local membership.

Faithful Color Corp Commander: Pat Naticchione, PFN