Terrestrial isopods, also known as sowbugs or woodlice, are one of the few types of crustaceans that can live their entire life on land. Some kinds of sowbugs have spread around the world through human activity and could have negative impacts (e.g. affecting decomposition, competing with native sowbugs, and co-introducing species living on or inside them). However, the study of sowbugs has been largely overlooked in Canada, especially in the Prairie Provinces. My goal was to document sowbugs in Alberta and provide a foundation for understanding their potential impact. Firstly, I collected sowbugs in Alberta, British Columbia, Saskatchewan, Ontario, and Newfoundland, and made an updated list of sowbugs in Canada. Alberta has nine species of sowbugs, including one never previously recorded from Canada; all nine are non-native. Secondly, I examined the sowbugs for species living on or inside them. I recovered nematodes, acanthocephalans, and mites from sowbugs in Alberta and British Columbia, including eight species never recorded from sowbugs. All species of sowbug symbionts from Alberta were uncommon and most were not parasitic. Finally, I used DNA sequencing to explore the history of an introduced sowbug in Alberta (Porcellio spinicornis). My results showed this sowbug was likely introduced at least three times, probably recently. Overall, it is unlikely that sowbugs currently pose a threat to Alberta’s ecology, economy, or human health. However, given the probable recency of sowbug introduction, sowbugs in Alberta should be monitored in case they move outside of urban areas where they were introduced.