This paper outlines broad changes in foreign ownership in Canada over the last forty years. It makes use of several different but complementary data sources that are produced by Statistics Canada to analyze the importance of foreign ownership in Canada. Over the last four decades, foreign multinationals that are operating in Canada have experienced first, a retrenchment and then, a resurgence in their activities. This retrenchment occurred during the period when foreign investment was tightly regulated and could be found across most industries, but was particularly evident in the energy and mining sector. The resurgence that has occurred subsequent to the introduction of a more liberal regulatory regime was also relatively widespread, though there are several sectors like the science-based and energy industries where this has not occurred.