  This volume contains the proceedings of ICE'18, the 11th Interaction and
Concurrency Experience, which was held in Madrid, Spain on the 20th and 21st of
June 2018 as a satellite event of DisCoTec'18.
  The ICE workshop series features a distinguishing review and selection
procedure, allowing PC members to interact anonymously with authors. As in the
past ten editions, this interaction considerably improved the accuracy of the
feedback from the reviewers and the quality of accepted papers, and offered the
basis for lively discussion during the workshop. For the second time, the 2018
edition of ICE included double blind reviewing of original research papers, in
order to increase fairness and avoid bias in reviewing.
  Each paper was reviewed by three PC members, and altogether six papers were
accepted for publication (the workshop also featured four oral presentations
which are not part of this volume). We were proud to host three invited talks,
by Elvira Albert, Silvia Crafa, and Alexey Gotsman. The abstracts of these
talks are included in this volume together with the regular papers. Final
versions of the contributions, taking into account the discussion at the
workshop, are included.
