Wizardry is a series of role-playing video games originally created by American publisher Sir-Tech. The series was influential in the evolution of modern role-playing video games alongside Ultima and Might and Magic. The original Wizardry was a significant influence on early console role-playing games such as Shin Megami Tensei, Dragon Slayer, the Shining series, Fire Emblem, Final Fantasy and Dragon Quest. Originally made for the Apple II, the games were later ported to other platforms. The last game in the original series by Sir-Tech was Wizardry 8, released in 2001. There have since been various spin-off titles developed for the Japanese market.

Wizardry began as a simple dungeon crawl by Andrew C. Greenberg and Robert Woodhead. It was written when they were students at Cornell University and published by Sir-Tech. The game was influenced by earlier games from the PLATO system, most notably Oubliette. The earliest installments of Wizardry were very successful, as they were the first graphically-rich incarnations of Dungeons & Dragons-type gameplay for home computers. The release of the first version coincided with the first wave of Dungeons & Dragons' popularity in North America.

The first five games in the series were written in Apple Pascal, an implementation of UCSD Pascal. They were ported to many different platforms by writing UCSD Pascal implementations for the target machines (Mac II cross-development). David W. Bradley took over the series after the fourth installment, adding a new level of plot and complexity. In 1998, the rights were transferred to 1259190 Ontario Inc., and in 2006, to Aeria IPM. In 2008, Aeria IPM merged with Gamepot, the developer of Wizardry Online and in 2017, Gamepot was shut down and absorbed into its parent company GMO Internet. Drecom announced they had acquired Wizardry from GMO Internet on October 29, 2020.

In May 2024, a 3D remake of Wizardry: Proving Grounds of the Mad Overlord with the same name as the original was released on modern platforms. Said remake was developed by Digital Eclipse, who wasn't previously involved with the Wizardry series.

Datamost released the menu-driven WizPlus, a utility program that allowed users to make changes to both the characters and also to the playing environment of Wizardry; Bob Reams reviewed the utility for Computer Gaming World, and said that "WizPlus should be used with great caution or the spirit of adventuring will be diluted and, more importantly, you will not be able to continue with this exciting series".

The original Wizardry series is composed of eight different titles. All of the titles were first released in North America, and then ported to Japanese computers. Some of the titles were also officially released in Europe. The first three games are a trilogy, with similar settings, plots, and gameplay mechanics. A second trilogy is formed by installments 6 through 8 – Bane of the Cosmic Forge, Crusaders of the Dark Savant and Wizardry 8 – with settings and gameplay mechanics that differed greatly from the first trilogy. The fourth game, The Return of Werdna, was a significant departure from the rest of the series. In it, the player controls Werdna ("Andrew", one of the game's developers, spelled backwards), the evil wizard slain in the first game, and summons groups of monsters to aid him as he fights his way through the prison in which he had been held captive. Rather than monsters, the player faced typical adventuring parties, some of which were pulled from actual user disks sent to Sir-Tech for recovery. Further, the player had only a limited number of keystrokes to use to complete the game.

In Japan, the Wizardry series was translated by ASCII Entertainment, and became very influential during the 1980s, even as its popularity at home declined. When first introduced, the games suffered from the culture barrier compounded by low-quality translation. This meant that the game was taken seriously by players who overlooked the in-game jokes and parodies. For example, Blade Cusinart was introduced in early games as "a legendary sword made by the famous blacksmith, Cusinart [sic]" but its meaning was misinterpreted because Cuisinart food processors were virtually unknown in Japan. However, this misconception appealed to early computer gamers who were looking for something different and made the Wizardry series popular. Conversely, the fourth game, The Return of Werdna, was poorly received, as, lacking the knowledge of subcultures necessary to solving the game, Japanese players had no chance of figuring out some puzzles.

The eight main titles in the series are: