To commemorate the 75th anniversary of the Naval Research Laboratory (NRL), 75 innovations were formally recognized in a ceremony held on June 19, 1998 in Washington, D.C. These innovations were selected to reflect the breadth and the sustained impact of the Laboratory's program. They include some of NRL's most important contributions to science, technology, national security, and society. They are, however, not to be interpreted as the 'Top 75.' While a few are scientific in nature, such as the Nobel Prize-winning work in chemistry, most are technological innovations that have found use in military and/or industrial applications. All are unclassified. Therefore, some major contributions, in areas such as space systems and electronic warfare, could not be publicly recognized.