USENIX Annual Technical Conference

ACM SIGOPS Annual Technical Conference
AbbreviationATC
DisciplineSystems research
Publication details
PublisherACM
History1975–now
Frequency
  • Biannual (1975–1994)
  • Annual (1995–now)

The ACM SIGOPS Annual Technical Conference, or ATC for short, is an academic conference focused on systems research. It is sponsored by the ACM through SIGOPS, the Special Interest Group on Operating Systems. Between 1975 and 2025, ATC was sponsored by USENIX and constituted its flagship conference for many years; for much of this period, it was referred to simply as "USENIX." After 50 years of activity, USENIX decided to sunset ATC, but SIGOPS stepped in to continue the conference in response to strong support from the community.