The Associateship of the Royal College of Science (ARCS) is an honorary degree-equivalent award presented by Imperial College London to students who complete an undergraduate course of study in science. The Royal College of Science, and its sister institutions the Royal School of Mines and the City and Guilds College, were the original institutions that merged to form the Imperial College of Science and Technology, later Imperial College London, but were wholly absorbed into the College as part of the 2002 re-shuffle that replaced the former Colleges with Faculties. However, the ARCS is still awarded to graduates today.
In practice, the associateship is always awarded in conjunction with a standard recognised degree, such as a BSc or an MSc. Persons awarded the associateship are entitled to use the post-nominal letters ARCS in addition to their standard designated degree post-nominals.