The Transformers (トランスフォーマー, Toransufōmā) is a line of mecha toys produced by Japanese company Takara (now known as Takara Tomy) and American toy company Hasbro. Initially a line of transforming mecha toys rebranded from Takara's Diaclone and Micro Change toy lines, it spawned the Transformers media franchise.

The premise behind the Transformers toy line is that an individual toy's parts can be shifted about to change it from a vehicle, a device, or an animal, to a robot action figure and back again. The franchise's taglines, "More Than Meets the Eye" and "Robots in Disguise", reflect this ability.

The Transformers toy-line is typically divided into two main factions: the heroic Autobots and their opponents, the evil Decepticons. They are known in Japan as the Cybertrons and Destrons, respectively, although more recent releases often use the English terms.

Many spin-offs are based on the toys including a comic book series, an animated television series, and the feature-length animated The Transformers: The Movie. The original TV series has a number of spin-offs and reboots. A live-action film series was launched in 2007 by director Michael Bay and had 5 movies.