Veganuary 2021 saw over 582,000 people from 209 countries and territories signing up to try vegan for the month of January. Together, they were able to spare more than 2 million animals from suffering in just one month. Additionally, the campaign led to the launch of 825 new vegan products and menu options, generated over 1500 media stories, and reached a combined social media audience of 224 million.

The impact of Veganuary's 2021 campaign was significant, with one in twenty Britons attempting to go vegan in January. This equates to around three million people in Britain trying vegan as a result of the 'Veganuary Effect'. A Kantar study found that half of Britons who tried vegan in January 2021 plan on continuing with diet changes, with around 1.5 million people in Britain adopting a more plant-based diet. Veganuary's CEO, Ria Rehberg, believes that a world where plant-based food is mainstream is possible, and this year's campaign provided a glimpse of that potential future.