Radio Maryja [ˈradjɔ maˈrɨja] is a religious and political socially conservative Polish radio station. It was founded in Toruń, Poland, on 9 December 1991, by the Redemptorist Tadeusz Rydzyk. The name "Maryja" is a traditional Polish form of the name "Mary", referring to the Virgin Mary.

Radio Maryja's programmes consist of broadcasts from the station's news agency; frequent recitals of the rosary, the breviary, and the Chaplet of the Divine Mercy; the unction to the Black Madonna of Częstochowa; discussions on the Catechism of the Catholic Church; a daily transmission of the Mass; coverage of papal trips; and sociological and political programmes. It takes positions against feminism, gay rights, the "Islamisation" of Europe, Middle Eastern refugees and the EU, and promotes social conservatism.

Radio Maryja's audience is reputed to consist mostly of rural and elderly listeners. The station says that it has "millions of listeners"; market research indicates approximately 1.2 million people daily. The station estimates that it is listened to by well over 10% of adults in Poland; the most comprehensive market research by Radio Track for the whole of Poland (June–July 2005) shows a 2.5% "share of listening time".

The Economist has summarized that, "The church in Poland is divided between Vatican loyalists, who often oppose close involvement in politics, and energetic dissidents linked to Radio Maryja, a hardline broadcaster. This once had huge clout, articulating the feelings of Poles alienated by the country's brisk, materialist business culture and the decay in moral norms. But Radio Maryja's audience has shrunk in the past decade to no more than 2% of all current listeners."

The station is owned by the Warsaw Province of the Congregation of the Most Holy Redeemer, and is financed through donations from its audience. This is an unusual characteristic in Poland, where most radio stations are either publicly funded or dependent on advertising revenue. Due to a concordat with the Holy See that grants certain privileges to the Church, Radio Maryja is not bound by normal accounting rules as it is regarded as being Church-operated. Thus, Radio Maryja is not required to disclose the exact sources of its financing or enterprises, and does not pay taxes. Radio Maryja has disclosed that it is financed by Jan Kobylański, an Uruguay-based billionaire and by Edward Moskal, the chairman of the Polish American Congress.

In February 2011, the local district court of Toruń issued a fine of 3,500 zloty to Fr Rydzyk, finding that he illegally used Radio Maryja broadcasts to raise funds for his television station, Telewizja Trwam; his University of Social and Media Culture; and a geothermal drilling project run by Fundacja Lux Veritatus. Fr Rydzyk denounced the verdict, calling it an "injustice" and saying that Polish law ran "contrary to natural law." To date, he has refused to pay the fine. In August 2012, a political controversy transpired when Anna Sobecka, a Law and Justice MP and close ally of Rydzyk's, applied to pay the fine from her own pocket despite not having the authorization to do so. The district court of Toruń requested that the police investigate her action. Later in 2012 Radio Maryja was fined by the National Broadcasting Council for "hidden advertising".

Enterprises related to Radio Maryja include the television station Trwam ("I Persist"); a daily newspaper Nasz Dziennik ("Our Daily"); the Nasza Przyszłość ("Our Future") Foundation; the Lux Veritatis Foundation ("The Light of Truth Foundation"); and the Wyższa Szkoła Kultury Społecznej i Medialnej ("The College of Social and Media Culture") in Toruń.

Radio Maryja sparked many controversies and is frequently criticised both in Poland and abroad. Bishop Tadeusz Pieronek, the former secretary general of the Episcopate of Poland, said that Radio Maryja is "a real and growing problem", adding that the station "offers a reduced view on Christianity" that is "extremely compromising and shameful, sick and dangerous."