Національний університет «Острозька академія» — наступник першого вищого навчального закладу східнослов’янських народів — Острозької слов’яно-греко-латинської академії. Заснував академію у 1576 році князь Василь-Костянтин Острозький. Велику суму коштів на розбудову академії надала його племінниця — княжна Гальшка Острозька. В основу діяльності Острозької академії було покладено традиційне для середньовічної Європи вивчення семи вільних наук (граматики, риторики, діалектики, арифметики, геометрії, музики, астрономії), а також вищих наук: філософії, богослів’я, медицини. Спудеї Острозької академії опановували п’ять мов: слов’янську, польську, давньоєврейську, грецьку, латинську. Унікальність та оригінальність цього вищого закладу освіти виявилися й у тому, що тут уперше поєдналися два типи культур: візантійська і західноєвропейська. З Острозькою академією пов’язуєть ренесанс українського народу.
Серед випускників академії — гетьман війська Запорізького Петро Конашевич-Сагайдачний, перший ректор київської братської школи Іов Борецький, лаврський архімандрит Єлисей Плетенецький, письменник Мелетій Смотрицький, автор знаменитої «Палінодії» Захарія Копистенський, відомий церковний і культурний діяч Ісакія Борискович та ін.
Острозька академія припинила своє існування у 1636 році. Однак результати її діяльності не зникли безслідно. Сформований тут тип вищого навчального закладу був перенесений до Києва, звідки поширився до Молдавії та Москви.

Хроніка відродження Острозької академії в незалежній Україні починається у 1994 році з Указу Президента України. Завдяки наступним указам Президента України розбудова Острозької академії набрала нових обертів.
У жовтні 2000 року Острозька академія отримала статус національного університету, а 23 серпня 2003 року був оприлюднений Указ Президента України, згідно з яким Національний університет «Острозька академія» переходив під патронат Президента України.
Згідно з постановою Кабінету Міністрів України від 29 липня 2009 року № 798, НаУОА надано статус самоврядного (автономного) дослідницького національного вищого навчального закладу.
Острозька академія відзначена 27-м призом «За якість» від Міжнародного трейд-клубу лідерів торгівлі у Парижі за активний розвиток і впровадження норм європейської освіти в життя, а також є членом Європейської асоціації університетів. Міністерство освіти України відзначило НаУОА дипломом за інноваційний розвиток освіти та сучасні педагогічні технології та Дипломом за організацію студентської науково-дослідної роботи.
Національний університет «Острозька академія» є членом Європейської Асоціації Університетів з 2010 року, членом Консорціуму українських університетів та Варшавського Університету, а також член Східноєвропейської мережі університетів. У 2014 році Острозька академія увійшла в десятку рейтингу прозорості національних університетів (Центр дослідження суспільства).
За результатами моніторингу веб-сайтів вищих навчальних закладів України, проведеного у 2014 році експертами Громадянської мережі ОПОРА, офіційний сайт Національного університету «Острозька академія» потрапив на п’яту сходинку цього рейтингу (серед офіційних інтернет-сторінок 274 вишів).
Національний університет «Острозька академія» посів третю сходинку серед класичних університетів та шосту загалом у рейтингу вишів України за якісним показником абітурієнтів.
Університет занесений до Книги рекордів Гіннеса у номінації «Найдовший поетичний марафон» за проведення безперервного 456 годинного марафону читання «Кобзаря» до 200-річчя з дня народження Тараса Шевченка.
У 2016 році Національний університет «Острозька академія» посів шосту сходинку серед українських вищих навчальних закладів та 650-те місце в світі відповідно до міжнародного рейтингу Round University Ranking. Рейтинг складається за даними однієї з найбільших інформаційно-аналітичних компаній світу Thomson Reuters.

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