The Justice Party (Ukrainian: Партія «Справедливість», romanized: Partiia «Spravedlyvist»; formerly known as the Party of All-Ukrainian Union of the Left "Justice" (Ukrainian: Партія Всеукраїнського об'єднання лівих "Справедливість", romanized: Partiia Vseukrainskoho obiednannia livykh "Spravedlyvist", Russian: Партия Всеукраинского объединения левых "Справедливость", romanized: Partiya Vseukrainskogo ob"edineniya levykh "Spravedlivost'") is a left-wing political party in Ukraine. The party merged into the (then) new party United Left and Peasants (Ukrainian: Об'єднані ліві і селяни, romanized: Obiednani livi i seliany, Russian: Объединенные левые и крестьяне, romanized: Ob"edinennye levye i krest'yane) in December 2011. Justice Party leader Stanislav Nikolaenko became the first party leader of United Left and Peasants. United Left and Peasants changed its name to Justice Party in 2014.

It was founded in 2000 by a group of former Socialist Party of Ukraine (SPU) members led by Ivan Chizh who were in opposition to SPU leader Oleksander Moroz.

The party ran independently during the 2002 parliamentary elections gaining 0,08% of the votes and no seats. At the parliamentary elections on 26 March 2006 the party was part of the electoral Lytvyn's People's Bloc, which won 2.44% of the popular vote and no seats. The party did not participate in the 2007 parliamentary elections.

In 2007 the SPU lost the parliamentarian elections, in order to "return into big policy" a group of SPU members including former minister of education of Ukraine Stanislav Nikolaenko and Aleksander Baranivskiy founded in 2008 the Union for Renewal of SPU and proposed 10 steps stated in the program "A Just Ukraine" to SPU leader Moroz. But the conservative entourage of Moroz persuade him to refuse the "road map for self-protection".

In March 2009 Nikolaenko and Baranivskiy left the SPU. In April 2009 Justice party's founder Ivan Chizh offered to implement the program "A Just Ukraine" and principals of the Union for Renewal on the basis of his Justice party. On 15 April, Nikolaenko accepted an offer to chair the party. This decision was supported by the party's Congress and Council. Former Head and party's founder Ivan Chizh was elected as an Honorary Head. Former Minister of agrarian policy Oleksandr Baranivskiy was elected to the Deputy Head post.

Based on the program "A Just Ukraine" Nikolaenko addressed to the leaders of left parties to create a "Forum of Left Forces" and conduct the parliamentary elections campaign as one team. The idea of supporting a joint candidature to the presidential elections from left forces was also a subject of discussion.

The newly elected head proposed to adopt changes to the Statutes aimed at a democratization of the decision making process within the party and limit the number of presidency terms to three, two years each (maximum 6 years). He proposed to conduct secret voting, primaries.

It was applied to be an observer member of the European Left.