Bloons Tower Defense 5 is a tower defense game based on the Ninja Kiwi website.

Bloons Tower Defense 5 (or BTD5 for short) was developed by Ninja Kiwi for PC, Mac, iPhone, iPad, and Android. It was released in December 2011, succeeding Bloons Tower Defense 4 (2009), and preceding Bloons Tower Defense Battles (2012) - a multiplayer, competitive version of Bloons Tower Defense 5.

It is about evil balloons that want to ruin the fun of the local primate inhabitants. Place monkeys on a course to destroy the balloons before they reach Monkey City. Courses are ranked by difficulty and monkeys placed can gain exquisite powers unique to that monkey.