Ilirida (Albanian: Ilirida; Macedonian: Илирида, romanized: Ilirida) or the Republic of Ilirida (Albanian: Republika e Iliridës; Macedonian: Република Илирида, romanized: Republika Ilirida) is a proposed state in the western regions of North Macedonia (then Republic of Macedonia), declared twice by the politician Nevzat Halili, once in 1992 and again in 2014. The proposal has been declared unconstitutional by the Macedonian government. The secessionist concept of Ilirida emerged in the early 1990s and was advocated by some Albanian politicians as a solution to concerns and disputes the Albanian community had regarding constitutional recognition and minority rights within Macedonia.

The name Ilirida is a portmanteau formed from the words Illyri(a) and Da(rdania), which are the names of ancient regions that covered parts of modern-day North Macedonia.

Following the breakup of Yugoslavia, the position of ethnic Albanians was uncertain in the early years of the new Macedonian republic. Various Albanian political parties emerged, of which the Party for Democratic Prosperity (PDP) was the largest and most prominent. The PDP called for the improvement of the status of Albanians in Macedonia, such as extended education rights and Albanian language usage, constitutional changes, release of political prisoners, proportional voting system and an end to discrimination. Discontent with the lack of constitutional recognition of collective rights for Albanians resulted in PDP leader Nevzat Halili declaring his party would regard the constitution as invalid and move toward seeking autonomy.

Later, a referendum on the status of the Albanians in Macedonia, declared illegal by the Macedonian government, was held in January 1992. 74% out of 92% of those eligible to vote, voted for the autonomy of the Albanians. On March 31, 1992, about 40,000 ethnic Albanians demonstrated in the streets of Skopje, asking that Macedonia remain an unrecognized state until areas with an Albanian majority were autonomous.

On April 6, 1992, the Republic of Ilirida was proclaimed in Struga by Albanian activists, in front of a crowd of 2,500 people. The main organizer being the PDP leader, Nevzat Halili.

The proposed republic would have covered approximately half of Macedonia's territory, mainly where Albanians form large concentrations and majorities in the west and northwest of the country. It intended to unite all Albanians living in Yugoslavia. Later on, the aim of the activists was that of favoring the federalization of Macedonia.

On November 6, 1992, Macedonian police used force to disperse ethnic Albanians who were protesting for the release of a cigarette smuggler. Clashes with police resulted in the deaths of 4 Albanians and 36 injured. The police seized 2,000 leaflets signed by the Ilirida Albanian youth movement, which urged the Albanians of Macedonia to wage war for their rights of self-determination.

Macedonian leadership opposed the demands as they viewed them a "Trojan horse" that could lead to secession and become part of campaign geared toward creating Greater Albania by uniting to Albania other areas in the Balkans.