The British television investment show's title is written “Dragons' Den,” with the apostrophe after the s.
The plural possessive punctuation reflects the programme's concept: the den belongs to several dragons, meaning the group of investors. The official title therefore differs from the singular possessive form “Dragon's Den,” although the latter is commonly typed when people search for the show.
The punctuation is also visible in the English Wikipedia article title, where the apostrophe is URL-encoded. International adaptations often use different animal imagery and names, so the exact British title helps distinguish this series from Shark Tank and other local versions.
This is a spelling and title fact rather than a change in the programme's format. The investors remain known as dragons, and the central action still involves entrepreneurs seeking money in exchange for equity.