Luigi (ルイージ, Ruīji^?) is a fictional character, featured in video games and related media released by Nintendo. Created by prominent game designer Shigeru Miyamoto, Luigi is portrayed as the slightly younger fraternal twin brother of Nintendo's mascot Mario, and appears in many games throughout the Mario series, frequently as a sidekick to his brother and the deuteragonist of the series.

Luigi first appeared in the 1983 arcade game Mario Bros. as the character controlled by the second player, and retained this role in Super Mario Bros., Super Mario Bros. 3, Super Mario World, and other titles. The first game where he was available as a primary character was Super Mario Bros. 2. In more recent appearances, Luigi's role became increasingly restricted to spinoffs such as the Mario Party and Mario Kart series, though he has been featured in a starring role on two occasions: first in the 1991 educational game Mario is Missing, later in Luigi's Mansion for the Nintendo GameCube in 2001 and in Luigi's Mansion 2 for the 3DS. In both of these games, he is called upon to act as the hero because Mario, the usual hero within the franchise, is in need of rescue. Luigi has also appeared in every episode of the three DiC TV series based on the Nintendo Entertainment System and Super Nintendo Entertainment System games.

Luzzatti or Luzzati are Italian Jewish surnames:

Luigi Luzzatti (March 11, 1841 – March 29, 1927) was an Italian political figure and served as the 31st Prime Minister of Italy between 1910 and 1911. He was Italy's second Jewish prime minister after Alessandro Fortis, though predecessor Sidney Sonnino was of partial Jewish ancestry.

He is remembered being the founder of the Italian credit union movement and for his book Dio nella libertà (God in Freedom), in which he advocates religious tolerance. This provoked an exchange of correspondence between him and Benedetto Croce.

Luzzatti was born of Jewish parents in Venice on the March 11, 1841. After completing his studies in law at the University of Padua, he attracted the attention of the Austrian police by his lectures on political economy, and was obliged to emigrate. In 1863 he obtained a professorship at the Milan Technical Institute; in 1867 he was appointed professor of constitutional law at Padua, whence he was transferred to the University of Rome. Gifted with eloquence and energy, he popularized in Italy the economic ideas of Franz Hermann Schulze-Delitzsch, worked for the establishment of a commercial college at Venice, and contributed to the spread of people's banks on a basis of limited liability throughout the country.