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Daniel,

Son of Spike and Carly. In The Rebirth, part 1 he is made into the head of Arcee.

Darkwing,

Decepticon. Transforms into a jet. Throttle transforms into his engine. Together with Dreadwind he can form the superjet "Dreadwing". He is one of the Powermasters.

Dead End,

Decepticon. Transforms into a car. He is one of the Stunticons.

Decepticon Anti-Aircraft Base,

Decepticon Micromaster. This base transforms into a tank, it is operated by Blackout and Spaceshot.

Decepticon Cassettes,

See Spy-Cassettes.

Decepticon Clones,

Two Decepticons that look the same, but they transform into different shapes. Pounce transforms into a jaguar, Wingspan transforms into a bird.

Decepticon Headquarters,

The Decepticons use their spaceship that crashlanded in the ocean at the end of More Then Meets The Eye, part 3 as their new base on earth.

Decepticon Jets,

See Decepticon Planes.

Decepticon Planes,

Diverse group of Decepticons. They are also called Decepticon Jets or Planes. Some of them were released for a second time, the group was then called the Skyraiders. Their names are:
Cyclonus
Dirge
Ramjet
Scourge
Skywarp
Starscream
Thrust
Thundercracker

Decepticons,

"The bad guys"

Defensor,

This Transformer is a Gestalt, formed by the five Protectobots.

Deluge,

Autobot. Transforms into a car. He is one of the four Aquaspeeders.

Deluxe Insecticons,

Group of four Decepticons. They didn't appear in the series, the reason for this you can read in the comment written with Jetfire. Their names are: Barrage, Chop Chop, Ransack and Venom.

Deluxe Vehicles,

Two Autobots: Roadbuster and Whirl. They didn't appear in the series, the reason for this you can read in the comment written with Jetfire.

Depth Charge,

Maximal. Comes from the Beast Wars. He is a Transmetal Figure, transforms into a manta ray or interdimensional cruiser.

Destrons,

Inhabitans of Master, they made an alliance with the Decepticons.

Detour,

Decepticon micromaster. Transforms into a car. He is a member of the Sports Car Patrol.

Devastator,

This Transformer is a Gestalt, formed by the six Constructicons.

Devastator,

Decepticon Actionmaster. His weapon transforms into a scorpion.

Dinobot,

Maximal. Comes from the Beast Wars. Transforms into a Raptor.

Dinobots,

Group of five Autobots. Their names are:
Grimlock
Slag
Sludge
Snarl
Swoop

Direct-Hit,

Decepticon Micromaster. Transforms together with Power Punch into a military vehicle. He is a member of the Battle Squad.

Dirge,

Decepticon. Transforms into a jet. He is one of the Decepticon Planes.

Dirtbag,

Decepticon from the second generation. Transforms into a construction vehicle. He is one of the two Autorollers.

Divebomb,

Decepticon. Transforms into an eagle. He is one of the Predacons.

Dogfight,

Autobot. Transforms into a fighter. He is one of the Triggerbots.

Double Clutch,

Autobot from the second generation. Transforms into a race car. He is one of the Gobots.

Doublecross,

Autobot. Transforms into some sort of dragon. He is one of the Monsterbots.

Doubledealer,

Decepticon. This mercenary has both a Autobot and a Decepticon mode. With the help of Knok he can transform into an Autobot robot, with the help of Skar he can transform into a Decepticon bird. As an Autobot he can also transform into a missile trailer. He is one of the Powermasters.

Doubleheader,

Autobot. Transforms into a plane. He is one of the Pretender Figures.

Double Punch,

Decepticon Actionmaster. Transforms into a scorpion. He is one of the Actionmaster Elite Figures.

Downshift,

Autobot. Transforms into a car. He is one of the Omnibots.

Dragstrip,

Decepticon. Transforms into a race car. He is one of the Stunticons.

Dreadwind,

Decepticon. Transforms into a jet. Hi-Test transforms into his engine. Together with Darkwing he can form the superjet "Dreadwing". He is one of the Powermasters.

Dreadwing,

This superjet is formed by the two decepticon Powermasters: Darkwing and Dreadwind.

Drill Bit,

Predacon. Comes from the Beast Wars. Transforms into some sort of animal.

Dropshot,

Decepticon micromaster. Transforms into a armoured car. He is a member of the Military Patrol.

Duocons,

Group of two Decepticons: Battletrap and Flywheels. They both exist out of two vehicles, that can combine to form the robot.

Duros,

Nebulon. Transforms into Hardheads head.