The Symposium on Operating Systems Principles (SOSP), organized by the Association for Computing Machinery (ACM), is one of the most prestigious single-track academic conferences on operating systems.
Before 2023, SOSP was held every other year, alternating with the conference on Operating Systems Design and Implementation (OSDI); starting 2024, SOSP began to be held every year. The first SOSP was held in 1967. It is sponsored by the ACM's Special Interest Group on Operating Systems (SIGOPS).