CCF ASoftware Engineering and PL2022: APublisher: ACM
SOSPACM Symposium on Operating Systems Principles
SOSP is a rank A conference in Software Engineering, System Software and Programming Languages in the CCF list's 7th edition (2026), as in 2022. The SOSP 2027 deadline is not announced; past editions suggest mid April. SOSP 2026 took place on Sep 30 – Oct 2, 2026 in Clarion Congress Hotel Prague, Prague, Czechia. Acceptance rate 2025: 17.7% (65/368).
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Data updated 8 November 2026 · rank from the CCF list's 7th edition
Latest edition
SOSP 2026: call for papers timeline
- Mar 27, 2026, 11:59 UTCAbstractCommunity data · unverified
- Apr 2, 2026, 11:59 UTC
- Sep 30 – Oct 2, 2026Local timeConferenceClarion Congress Hotel Prague, Prague, Czechia
AoE (Anywhere on Earth) is UTC−12 (time zones explained). These dates come from the ccf-deadlines community project and have not yet been checked against the conference website; confirm them there before you submit. Conference website ↗
Past editions
Dates, venues, deadlines and acceptance rates
| Year | Paper deadline | Acceptance | Papers (dblp) | Dates | Venue |
|---|---|---|---|---|---|
| 2026 | 2026-04-01AoE | — | 62 | Sep 30 – Oct 2, 2026 | Clarion Congress Hotel Prague, Prague, Czechia |
| 2025 | 2025-04-17UTC-7 | 17.7%65/368 | 66 | Oct 14–16, 2025 | Lotte Hotel World, Seoul, Republic of Korea |
| 2024 | 2024-04-19UTC-7 | — | 43 | Nov 4–6, 2024 | Hilton Austin, Texas, USA |
| 2023 | 2023-04-17UTC-4 | — | 43 | Oct 24–26, 2023 | Koblenz, Germany |
| 2021 | 2021-05-07UTC-7 | 15.5%54/348 · source | 54 | Oct 26–29, 2021 | Virtual |
| 2019 | — | — | 38 | — | — |
| 2017 | — | — | 39 | — | — |
SOSP 2027 deadline forecast: mid April (not announced). The last paper deadlines: 2026: Apr 2, 2026; 2025: Apr 18, 2025; 2024: Apr 20, 2024. The conference's own announcement decides.
Paper counts are dblp's main proceedings only, without workshop volumes; acceptance rates link to the page they come from. dblp ↗
CCF list
SOSP in the CCF list
- 7th edition (2026)
- CCF A Software Engineering, System Software and Programming Languages · no. 4
- 6th edition (2022)
- CCF A Software Engineering, System Software and Programming Languages
- Name in the list
- ACM Symposium on Operating Systems Principles
- Publisher
- ACM
- dblp
- conf/sosp ↗
CCF counts the full (regular) papers of a listed conference: short papers, demos, technical briefs, summaries, Findings and the workshops held with a conference are outside the list. CCF also says the list is a recommendation and should not be used on its own to evaluate research; your institution's rules decide. What counts, case by case →
FAQ
About SOSP
What CCF rank is SOSP?
SOSP is a rank A conference in Software Engineering, System Software and Programming Languages in the CCF list's 7th edition (2026), as in 2022.
When is the SOSP 2027 deadline?
Not announced yet. The last paper deadlines were 2026: Apr 2, 2026; 2025: Apr 18, 2025; 2024: Apr 20, 2024, so mid April is likely; the conference's announcement decides.
Where is SOSP 2026?
SOSP 2026 took place on Sep 30 – Oct 2, 2026 in Clarion Congress Hotel Prague, Prague, Czechia.
What is the SOSP acceptance rate?
2025: 368 submissions, 65 accepted, 17.7%. 2021: 15.5% (54/348). The history table links each figure to its source.
Do SOSP workshop and short papers count as CCF A?
CCF counts the full (regular) papers of a listed conference: short papers, demos, technical briefs, summaries, Findings and the workshops held with a conference are outside the list. CCF also says the list is a recommendation and should not be used on its own to evaluate research; your institution's rules decide.
In more detail: Which CCF conference papers count · How to read conference deadlines
Sources: the CCF list of recommended international conferences and journals, 7th edition (published 31 March 2026, corrected 9 April 2026) and 6th edition (2022); editions, deadlines and acceptance rates from the ccf-deadlines community project (MIT licence), marked as community data until checked against each conference's website, then marked as checked with the website's own words; proceedings and paper counts from dblp (CC0).