Kadie Karen Diekmeyer (born September 24, 1964), popularly known as That Vegan Teacher, is a Canadian animal rights activist and former educator, mainly known for promoting veganism. Before she started her online career, Diekmeyer was a nurse and later an ESL teacher but eventually left the latter job at the start of the COVID-19 pandemic. Diekmeyer is known for her TikTok and YouTube accounts that promote veganism. Diekmeyer's content has been controversial, including accusations of racism.