[en] The Argonne Nuclear Data Program is identified with a number of scientific activities carried out within the broad framework of the US Nuclear Data Program (USNDP) Coordinated Work Plan. Emphasis is placed on nuclear structure and decay data, and their applications in nuclear physics research, and in applied nuclear technologies. Compiled and evaluated data are made available to the National Nuclear Data Center (NNDC) for inclusion in the Evaluated Nuclear Structure Data File (ENSDF) database, or results are published directly in peer-reviewed scientific journals. Contributions are also made to various specialized databases that serve specific needs in the fields of nuclear structure, nuclear astrophysics and applied nuclear physics. This effort includes the evaluation of atomic masses and complementary nuclear structure data for the Atomic Mass Evaluation (AME) and NUBASE databases, and compilations of recently published nuclear structure data for the XUNDL database (Unevaluated Nuclear Data List). Measurements aimed at providing answers to specific questions and improving the quality of existing databases in specific areas are also performed. Experiments are carried out at the US Department of Energy nuclear physics user facilities and at leading nuclear physics laboratories elsewhere through collaborative arrangements.