
Charles Grant Blairfindie Allen was a Canadian science writer and novelist, educated in England. He was a public promoter of evolution in the second half of the nineteenth century.

Carin Bondar is a Canadian biologist, writer, filmmaker, speaker and television personality. She is a host of Outrageous Acts of Science, Stephen Hawking's Brave New World, and Worlds Oddest Animal Couples.

Glen Dean Chilton is a Canadian-Australian scholar and author of humorous books on adventure travel and natural history.

Thomas Stephen Cullen was a Canadian gynecologist associated with Johns Hopkins Hospital.

Alice Eastwood was a Canadian American botanist. She is credited with building the botanical collection at the California Academy of Sciences, in San Francisco. She published over 310 scientific articles and authored 395 land plant species names, the fourth-highest number of such names authored by any female scientist. There are seventeen currently recognized species named for her, as well as the genera Eastwoodia and Aliciella.

Valerius Geist is a Canadian biologist and a professor emeritus in the Faculty of Environmental Design at the University of Calgary. He is a specialist on the biology, behavior, and social dynamics of North American large mammals.

Bruce MacFarlane Hood is a Canadian-born British experimental psychologist and philosopher who specialises in developmental cognitive neuroscience. He is currently based at the University of Bristol and his major research interests include the cognitive processes behind adult magical thinking.

Jay Ingram CM is a Canadian author, broadcaster and science communicator. He was host of the television show Daily Planet, which aired on Discovery Channel Canada, since the channel's inception in 1995. Ingram's last episode of Daily Planet aired on June 5, 2011. Ingram announced his retirement but stated he will make guest appearances on Daily Planet. He was succeeded by Dan Riskin. His book The End of Memory: A Natural History of Aging and Alzheimer’s is forthcoming from St. Martin's Press in 2015.

John David Jackson was a Canadian–American physics professor at the University of California, Berkeley and a faculty senior scientist emeritus at Lawrence Berkeley National Laboratory. A theoretical physicist, he was a member of the National Academy of Sciences, and is well known for numerous publications and summer-school lectures in nuclear and particle physics, as well as his widely used graduate text on classical electrodynamics. The book is notorious for the difficulty of its problems, and its tendency to treat non-obvious conclusions as self-evident. Jackson's high standards and admonitory vocabulary are the subject of an amusing memorial volume by his son Ian Jackson.
Lawrence Maxwell Krauss is an American-Canadian theoretical physicist and cosmologist who previously taught at Arizona State University, Yale University, and Case Western Reserve University. He founded ASU's Origins Project, now called ASU Interplanetary Initiative, to investigate fundamental questions about the universe and served as the project's director. Upon investigating allegations about sexual misconduct by Krauss, ASU determined that he had violated university policy and removed him from the Origins Project directorship in July 2018. He continued as a Professor at ASU until retiring in May 2019. He currently serves as President of The Origins Project Foundation and as host of The Origins Podcast with Lawrence Krauss.

Daniel Loxton is a Canadian writer, illustrator, and skeptic. He wrote or co-wrote several books including Tales of Prehistoric Life, a children's science trilogy, and Abominable Science!, a scientific look at cryptozoology. As editor of Junior Skeptic, Loxton writes and illustrates most issues of Junior Skeptic, a children's science section in the Skeptics Society's Skeptic magazine.

Bob McDonald OC is a Canadian author and science journalist. He is the national science commentator for CBC Television and CBC News Network, and since 1992 has been the host of a weekly radio science show, Quirks & Quarks which draws approximately 800,000 listeners each week.

Mika McKinnon is a Canadian field geophysicist, disaster researcher, and science communicator. She is a co-investigator of the Southwest Research Institute's Project ESPRESSO and was a science adviser to the science fiction television series Stargate Atlantis and Stargate Universe.

Vesna Milosevic-Zdjelar is a Serbian-born Canadian astrophysicist, science educator and author. Her specialty is teaching astrophysics to students enrolled in non-science programs at the University of Winnipeg.

Judith (Judy) H. Myers is a Canadian-American ecologist. In 2014 she was elected president of the Canadian Society for Ecology and Evolution. Professor Myers is well-known for her decades-long research into plant-animal-microbe interactions, including insect pest outbreaks, viral pathogens of insects, and pioneering work on biological control of insects and plants, particularly invasive species. Throughout her career she has advocated strongly for both the public understanding of science and for increasing the number of women in the STEM subjects: Science, Technology, Engineering, and Mathematics.

Penelope Dawn (Penny) Park was a Canadian journalist and science writer.

David Wayne Phillips, CM is senior climatologist for Environment Canada, spokesperson for the Meteorological Service of Canada, and author.

Steven Arthur Pinker is a Canadian-American cognitive psychologist, linguist, and popular science author. He is an advocate of evolutionary psychology and the computational theory of mind.

Hubert Reeves, is a Canadian astrophysicist and popularizer of science.

Joseph A. Schwarcz, born 1947, is an author and a sessional instructor at McGill University. He is the director of McGill's Office for Science and Society.

Václav Smil is a Czech-Canadian scientist and policy analyst. He is Distinguished Professor Emeritus in the Faculty of Environment at the University of Manitoba in Winnipeg, Manitoba, Canada. His interdisciplinary research interests encompass a broad area of energy, environmental, food, population, economic, historical and public policy studies, and he had also applied these approaches to energy, food and environmental affairs of China.

Joseph Dewey Soper was a widely traveled Canadian Arctic ornithologist, explorer, zoologist, and prolific author.

Ziya Tong is an English-born Canadian television personality and producer, formerly the co-host of Discovery Channel's long-running primetime science magazine, Daily Planet.

Franklin Marshall Matthews White is a Canadian public health scientist focused on capacity building for international and global education, research and development. He advocates:"Public health...must not be left to the international community to define; it is...the responsibility of the countries themselves to define their priorities. The global agenda should be viewed as complementary at best.""Health is mostly made in homes, communities and workplaces and only a minority of ill health can be repaired in clinics and hospitals.""Nations (must) assess their public health human resource needs and develop their ability to deliver this capacity, and not depend on other countries to supply it."

Mark L. Winston is a Canadian biologist and writer. A professor of apiculture and social insects at Simon Fraser University, he spent much of his career studying bees until becoming founding director of the university's Centre for Dialogue in 2006.

Samantha Yammine is a Canadian science communicator. She completed her PhD in 2019 at the University of Toronto.