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Alpha 5 is a fictional character from the television series Mighty Morphin Power Rangers. A fully self-aware artificial intelligence, he is the robot assistant of the Power Rangers, and resides in their base of operations, the Command Center along their mentor Zordon. The character is known for his "Aye-yi-yi-yi-yi!" catchphrase.

Alpha 5 has been physically portrayed by multiple actors: Romy J. Sharf, Sandi Sellner and Donene Kistler in the TV series, and Peta-Maree Rixon in Mighty Morphin Power Rangers: The Movie. Richard Steven Horvitz voiced Alpha 5 for the character's appearances in most Power Ranger franchise media, starting from Mighty Morphin Power Rangers television series until Power Rangers Turbo, which marked the character's final appearance in the Power Rangers TV series. In the 2017 reboot film, Alpha 5 is a CGI character voiced by Bill Hader. Various merchandise for the character, as with other of the series' characters, has been released since the inception of the Power Rangers franchise.

Alpha 5 appears as a recurring supporting character for the Power Rangers in the series. His role is to provide communications support for the Rangers on their missions and is responsible for maintenance of the Command Center. He also serves as the Rangers' technician, constructing weapons for them to use against their opponents. He is best known for his signature catchphrase, "Aye-yi-yi-yi-yi!", usually uttered by the character when he is distressed or excited. Alpha 5's original iteration is described by Nicholas Mojica of International Business Times as a "vintage robot look"; his head is shaped like a golden flying saucer, adorned with a visor that flashes when he is speaking. Another one of the character's visual cues is an inverted yellow stylized lightning bolt similar to the Power Rangers' lightning bolt symbol on his chest.

The character is depicted as naive and childlike in temperament, and often behaves like a surrogate younger sibling to the Power Rangers wanting to spend time with them.

Alpha 5 has not been a contender in any CBUB matches.