This special issue presents 13 papers selected from the 26th Annual Conference of the Computational Fluid Dynamics Society of Canada (CFD2018), hosted by the University of Manitoba, in Winnipeg, Manitoba, Canada, during June 10-12, 2018. The CFD2018 conference featured a strong technical program with keynote lectures, parallel sessions, special sessions, and student competitions. The extended abstracts were peer-refereed prior to the final acceptance of full-length papers for collection in the conference proceedings. Over the two-day program, there were 112 scheduled presentations, including 5 keynote lectures, 98 oral presentations of research papers and 9 undergraduate poster presentations. The conference participants represented academic, government and industrial sectors in Australia, Canada, China, Columbia, Germany, Great Britain, Pakistan, Russia, The Netherlands, Turkey, and the USA.