Computational Complexity Conference

CCC 2021, July 20–22, Online


CCC'21 was scheduled to be held at Toronto, ON, Canada, from July 20–23, 2021. Due to the public health measures in place worldwide, the conference will be held online, in an abridged format July 20–22.


The conference program has two components:
  • An asynchronous component consisting of pre-recorded talks and a discussion board. Half-hour talks by the authors of the accepted papers will be publicly available on the CCC YouTube channel.
  • A live component consisting of one-hour invited talks, half-hour talks on the award winning papers, and 10-minute talks on the accepted papers. The live talks will be given over Zoom during July 20–22, between 10 am and 3:15 pm EDT.

    The full schedule of live events is available here.

In addition, we have the following live events:
  • Business meeting: A business meeting will be held live over Zoom on Tuesday, July 20, 2:30 pm EDT.
  • Social gathering: An online social will be held on Wednesday, July 21, 3:15 pm EDT.
Information on accessing the live talks and events will be shared with the registered participants separately.

Code of Conduct

The open exchange of ideas and the freedom of thought and expression are central to the aims and goals of CCC. These require an environment that recognizes the inherent worth of every person and group, that fosters dignity, understanding, and mutual respect, and that embraces diversity. The CCC organizers are committed to providing an environment that is free of discrimination and harassment, and expect all participants to honor that commitment.

The organizers reserve the right to take any action they deem appropriate, including eviction from the live forum, in case of a violation of this code of conduct.


There is a registration fee for each accepted paper, to be paid by one of its authors. This fee covers a portion of the publication and other costs associated with the conference.

The pre-recorded talks will be available publicly, for free. Joining the live events is also free, but requires registration. There are a limited number of slots for the live events, and participants are encouraged to register early.

Registered participants automatically become members of the Computational Complexity Foundation (CCF) for a period of three years. This entitles them to participate in the elections for the CCF Board.

The registration fees and associated deadlines are listed below.

Registration Fees (USD)
Amount Deadline
Paper$120 June 24
Viewer $0 July 18

If you would like to receive announcements about CCC and other activities of the Computational Complexity Foundation (CCF), you may subscribe to the CCF/CCC announcement list by giving consent on the registration page. This list is maintained by the executive committee of CCF. Mailing list members remain on the list until they request to be removed or their email address no longer works. The mailing list receives no more than a handful of messages per year, which are all announcements regarding CCC or CCF.

Click to register for the conference.

Privacy policy

The registration information is used by the conference organizers to facilitate communication of registration confirmation and conference details, and for planning and running the event. Name, email address, status, and affiliation are shared with the executive committee of the Computational Complexity Foundation (CCF). Name and email address are used to determine the electorate for the CCF Board elections and for generating the ballots. Status and affiliation are used for statistics about conference attendance. Individual records are kept for no more than four years. Statistical data are kept indefinitely.

Some optional registration data have been requested by The Fields Institute, co-organizer of CCC'21, in order to support their Equality, Diversity and Inclusion initiatives. Their privacy policy is available here.

Local Organizers


Please email the local arrangements team.

Organized by:

In Cooperation with: