This is a list of video game accessories that have been released for the Game Boy handheld console and its successors. Accessories add functionality that the console would otherwise not have.

Game Boy

Game Boy Pocket Sonar

The Game Boy Pocket Sonar is a peripheral for the Nintendo Game Boy made by Bandai that used sonar to locate fish up to 20 meters (65 feet) underwater for the sport of fishing and contained a fishing mini-game. It was released only in Japan in 1998. It was the first sonar-enabled gaming accessory.

Game Boy camera and printer

The Game Boy Camera and Game Boy Printer (Pocket Camera and Pocket Printer in Japan) are accessories for the Game Boy handheld gaming system and were released in 1998. The camera can take basic, often grainy, black-and-white digital images using the four-color palette of the Game Boy system. The printer utilizes thermal paper to "burn" saved images, making a hard copy. There are also several minigames built into the camera itself. A picture of the player's face is used as an avatar in the minigames. Both accessories were marketed by Nintendo as light-hearted entertainment devices in all three major video game regions of the world: Japan, North America, and Europe. The former N64 Magazine went so far as to dedicate a monthly section to the devices.

The camera cartridge is inserted directly into the cartridge slot of a Game Boy Pocket, while the printer must be connected via a second generation Game Link Cable. Both accessories are also compatible with the original Game Boy, Game Boy Pocket, Game Boy Light, the Super Famicom's Super Game Boy 2, Game Boy Color, Game Boy Advance (original and SP), and the GameCube's Game Boy Player. Additionally, the Game Boy Camera is compatible with the original Super Game Boy, whereas the Game Boy Printer is not, because the printer must connect via a Game Link Cable. In order to connect to the original Game Boy, the printer must use a Universal Game Link Adapter. Besides being used for printing Game Boy Camera pictures, the Game Boy Printer can also be used on its own with certain Game Boy Color games, including Super Mario Bros. Deluxe, The Legend of Zelda: Link's Awakening DX, Donkey Kong Country, and Pokémon versions Yellow, Gold, Silver, and Crystal.

The Japanese version of the Game Boy Camera can be utilized in the Mario Artist suite of multimedia games for 64DD, via the Transfer Pak. Users can map photographs of their own faces onto 2D paintings and 3D animated avatars.

While the European and standard North American versions of the Game Boy Camera are essentially the same, they vary slightly from both the Japanese version (in more than just language) and the US-exclusive limited-edition gold Zelda version. Both also differ from the Japan Exclusive Golden Diddy Kong version.

Nintendo reportedly had plans to release a successor to the Game Boy Camera called the GameEye for the Game Boy Advance, which would have taken color photos and featured connectivity with the Nintendo GameCube, but the GameEye never saw a release.

Super Game Boy

The Super Game Boy is a plug-in cartridge for the Super NES that allows Game Boy and black cartridge Game Boy Color games to be played on a television screen. It was released in 1994. The black-and-white games can be colorized by mapping colors to each of the four shades of gray making up the Game Boy's color palette. There are also special Super Game Boy labeled Game Boy games that contain custom palettes and borders that only show up when played on a Super Game Boy. A 1998 follow-up released only in Japan, the Super Game Boy 2, includes different default borders, different music for the credits, and a link cable port, enabling support for multiplayer gaming and the Game Boy Printer.

Transfer Pak

The Transfer Pak, known in Japan as the 64 GB Pack, is a peripheral that plugs into the Nintendo 64 controller to transfer data between supported Nintendo 64 games and Game Boy or Game Boy Color games. While primarily designed to exchange data between games, the Pokémon Stadium series was capable of emulating connected Pokémon Game Boy games for play on the television. The Transfer Pak was released in Japan in August 1998, bundled with the game Pocket Monsters' Stadium, and in North America and Europe in March and April 2000 respectively, where it was similarly bundled with Pokémon Stadium.

Game Link Cable

The Nintendo Game Link Cable is used to link two or more systems in the Game Boy line of handhelds for multiplayer gaming. Games such as the Pokémon series use the Game Link Cable to transfer data between linked cartridges. Several different variations of Game Link Cables were produced as different Game Boy models had different link cable ports. Various adapters were also produced to interlink different Game Boy models. These variations and adapters are explained in the main article.

Game Boy Four Player Adapter

The Game Boy Four Player Adapter was designed to allow up to four players to play certain Game Boy games on the original Game Boy. The Game Boy Four Player Adapter consists of a small, gray hub with a single connector cable attached to connect to the first player's Game Boy. The second, third, and fourth players must each use their own Game Link Cables to connect their Game Boys to each of the three link cable ports on the main hub. Theoretically, using the proper Game Link Cables and adapters, this device is compatible with Game Boy consoles all the way up to the Game Boy Advance SP. However, the device is only compatible with a select few original Game Boy games, and will not work for Game Boy Color or Game Boy Advance games on the aforementioned systems. Since Game Boy Micro is not backwards compatible with original Game Boy games, the Game Boy Four Player Adapter is incompatible with it.

Game Boy Battery Pack The Game Boy Battery Pack sold for about . The battery peripheral itself is roughly 3 in. long, 2 in. wide, and 0.5 in. thick.Owner's Manual, p. 4. "(2) External power supply jack — You can connect a Rechargeable Battery Pack (sold separately) for longer play." One end sprouts a thin cable that ends by being plugged into the external power jack of the Game Boy, while the other end connects to a standard mains plug. The first version of it is gray with purple lettering, to match the colors used on the Game Boy. It also features a belt clip. The battery pack was good for several hours of gameplay per charge, providing an alternative to purchasing more AA batteries once their power had exhausted. The product used nickel-cadmium batteries, lasted about 4–5 hours per charge, and could be charged roughly 1000 times before a significant loss in effectiveness. A major drawback of the battery pack is its weight, as well as the way the plug stuck out prominently from the side of the Game Boy.

Handy Boy

The Joyplus Handy Boy is an official "all in one accessory" for the original Game Boy, manufactured by STD. It features two amplified external speakers that are positioned on each side of the screen. The Handy Boy adds a square magnifier which has simple light for illumination. These parts can fold together for travel. Additionally, a thumb joystick can be clipped onto the Game Boy with or without the speakers and magnifier.

Game Boy Color

Jaguar/Singer Sewing Machines Jaguar International released the "Nuyell" sewing machine (with a later deluxe model) in early 2000, with the Singer Corporation licensing and selling it as the "Izek" later that same year. There also existed a deluxe model of the "Nuyell", notably including a Game Boy Pocket. The sewing machines allowed the user to connect using a Game Boy Color and the cartridges that came with the machine. This allowed the user to embroider various letters and shapes and was designed to be a control interface, not a game. Jaguar International later released a new model, the "Nuotto", with significantly more features. One add-on cartridge created for this model by Jaguar was Mario Family, which allowed users to embroider a variety of characters from the Mario series of games. A similar game based on the Kirby franchise, Kirby Family, was developed but never released, though a ROM of the game surfaced in the 2020 Nintendo data leak.

Magic Card The Magic Card is an accessory that is used to change the color on a regular GB game on a GBC.

Boom Box Boy The Boom Box Boy, or the Game Boy FM Radio, is an accessory that plugs into the Link Cable port on the side of the unit. There are buttons to scan for radio stations or reset the scanning, volume control, and a headphone jack. It could also be used with the Game Boy Pocket.

Mobile Adapter GB

The Mobile Adapter GB, was a short-lived peripheral that allowed the handheld Game Boy Color and Game Boy Advance consoles to connect to a mobile phone, utilizing its cellular network for online interactions via the Mobile System GB service. Following delays, the device and service launched in Japan on 27 January 2001. Together, they enabled online functionality for roughly 20 games, most notably Pokémon Crystal and Mobile Golf. Nintendo ultimately chose not to release the adapter outside Japan, citing international wireless incompatibilities and market differences. Its high costs and limited game compatibility hindered widespread adoption, with only 80,000 units sold in its first year. The Mobile System GB service was discontinued on 18 December 2002.

Game Boy Advance GameCube Game Boy Advance Cable

The GameCube Game Boy Advance Cable is a link cable used to connect the GameCube and the Game Boy Advance. This provides an opportunity for added gameplay in certain GameCube and Game Boy advance games. Minigames can be downloaded to the Game Boy Advance, the Game Boy Advance may be used as an extra screen to supplement gameplay, or the Game Boy Advance can be used as an enhanced GameCube controller. One end of the link cable plugs into a GameCube controller port, and the other end plugs into the Game Boy Advance's link cable port. The cable is only compatible with the GameCube, Nintendo Wii, Game Boy Advance, Game Boy Advance SP, Game Boy Player, and e-Reader. The cable does not work with the Game Boy Micro, as the Micro has a non-standard link cable port. However, the Game Boy Micro Game Link Cable and GameCube Game Boy Advance Cable can be modified and spliced together in order to support compatibility with the Game Boy Micro.

Game Boy Player

Released in June 2003 as the spiritual successor to the Super Game Boy, the Game Boy Player allows Game Boy, Game Boy Color, and Game Boy Advance games to be played on a television screen via the GameCube. The add-on attaches to the GameCube's base through the "Hi Speed" port on the bottom and requires a boot disc to operate. On the front of the Game Boy Player is a link cable port, offering support for multiplayer gameplay, Game Boy Printer, and expanded e-Reader functionality. Essentially a Game Boy Advance designed to output to a television, the Game Boy Player uses the same colorization hardware and methods as the handheld system. Some Game Boy Advance games, such as Mario & Luigi Superstar Saga, have enhanced gameplay (such as force feedback) when played on the Game Boy Player, while the Game Boy Advance Video series is intentionally incompatible with the Game Boy Player due to concerns of piracy.

e-Reader