i29 is a Dutch interior architecture firm founded by designers Jasper Jansen and Jeroen Dellensenand in 2005. The practice designs interiors for projects spanning the hospitality, workplace, residential and retail sectors. The studio is based in Amsterdam and has a small team of under 10 designers. 

The studio was named Interior Designer of the Year at Dezeen Awards 2018 for projects including its renovation of the Princessehof National Museum of Ceramics' entrance and exhibition spaces in Leeuwarden, the Netherlands.