Pai Northern Thai Kitchen (simply Pai; stylized as PAI) is a restaurant chain in Toronto, Ontario, Canada serving northern Thai cuisine. Pai has two eat-in locations and three ghost kitchens. The chain is run by chefs Nuit Regular and Jeff Regular. Pai has been noted for its influence on Thai food in Toronto, and has been cited as one of the city's most liked spots for Thai food. Their menu focuses on authentic northern Thai cuisine with international influences; the most popular dish is their pad thai.
Nuit and Jeff had opened a number of Thai restaurants in Toronto before Pai. The first Pai location was opened in 2014 in Downtown Toronto. Following the opening, the Toronto Star left a positive review while The Globe and Mail left a mixed one. Pai opened a ghost kitchen with Kitchen Hub in early 2020 and an eat-in location in late 2020, situated in Yonge–Eglinton. They began operating a further two ghost kitchens in 2022.