PopoloCrois (ポポロクロイス物語, Poporokuroisu Monogatari) is a fantasy media franchise created by Yohsuke Tamori and owned by Sony Interactive Entertainment. It originated as a manga series in 1977 in the Asahi Student Newspaper (a subsidiary of the Asahi Shimbun newspaper). Its title, pronounced (PO-po-lo-croyce), is a combination of words from two languages: the Italian word "Popolo (people)" and the French "croisé (crossing)", which together mean "crossing of people". The franchise is geared towards a young Japanese audience, with the general theme of the series being love, compassion and racial equality. The franchise consists of a manga series, role-playing video games, two anime series in 1998 and 2003 and a series of novels.

PopoloCrois was first published in November 1978 in the women's magazine Pafu (ぱふ). In October 1984 the cartoon was published in the Asahi Shimbun Student Newspaper, which is considered the official start of the PoPoLoCrois series.

In 2013, Yohsuke Tamori and Atsuko Fukushima teamed up to create spin-offs Popolocrois novel called Maya Mensis Aureos that was published by Kaiseisha; it is ended as a trilogy.^{[citation needed]}

Years after the manga had ended distribution, Tamori sold the series to Sony Computer Entertainment, who released a series of role-playing video games based on the manga, developed by G-Artists for the PlayStation. The first video game was revealed in May 1994 together with Sony's new PlayStation, with a release for spring 1995. However it was not released until July of 1996. Famitsu magazine scored it 31 out of 40. In 2022, the game was fan translated into English. The second game, Poporogue, was released in 1998, and the direct sequel PoPoLoCrois Monogatari II was released in 2000. On June 20, 2002, Sony Computer Entertainment released PopoloCrois: Adventure of Beginnings (ポポロクロイス ～はじまりの冒険～, PoPoLoCrois: Hajimari no Bouken) for PlayStation 2, followed by Popolocrois: Adventure of the Law of the Moon (ポポロクロイス～月の掟の冒険～, Popolocrois: Tsuki no Okite no Bouken) on March 18, 2004.

The 2005 PlayStation Portable game remixes both the first two games into one, and was also the first PopoloCrois to be released overseas that year and in 2006. In 2015, a crossover with the Story of Seasons series of games was released worldwide as Return to PopoloCrois: A Story of Seasons Fairytale, it unusually released for a Nintendo console despite Sony's ownership of the series. A prequel novel PopoloChronicle taking place before the events of the first game was also released.

While random and turn-based, battles take on a form very similar to console strategy RPGs (such as Final Fantasy Tactics). When a character's turn begins, they can move along a small grid and attack enemies from four cardinal directions, each with their own advantages and disadvantages. For example, an attack to the enemy's back will deal more damage, as will skipping a turn to focus on the next turn.

The main character is the prince of the PopoloCrois kingdom, Pietro. The first game, PopoloCrois Monogatari, starts on the night of Pietro's 10th birthday, when he learns that his mother, who he thought was long dead, was found in a coma. Pietro sets out into a journey along with the apprentice forest witch Narcia to save his mother's soul from the underworld.

The main character is the prince of the PopoloCrois kingdom, Pietro. The first game, PopoloCrois Monogatari, starts at the night of Pietro's 10th birthday, when he learns that his mother, who he thought was long dead, was found in a coma. Pietro sets out into a journey along with the apprentice forest witch Narcia to save his mother's soul from the underworld.