Catalytic C-N coupling reactions are among the most important bond-forming events in synthetic chemistry. Ammonium salts are economic and easily available inorganic compounds, serving as ideal nitrogen sources for nitrogen-containing organic compounds. The use of ammonium salts highlights the synthesis of N-containing organic compounds from inorganic compounds. Therefore, it is of great significance to develop catalytic methods for the C-N reaction from ammonium salts. This JOCSynopsis focuses on the representative processes of catalytic C-N bond formation from ammonium salts.