Anti-LGBTQ rhetoric comprises themes, catchphrases, and slogans that have been used in order to demean lesbian, gay, bisexual, transgender, and queer (LGBTQ) people. Anti-LGBTQ rhetoric is widely considered a form of hate speech, which is illegal in countries such as the Netherlands, Norway, and Sweden.

Anti-LGBTQ rhetoric often consists of moral panic and conspiracy theories. LGBTQ movements and individuals are often portrayed as subversive and foreign, similar to earlier conspiracy theories targeting Jews and communists.

In 1969, the Greek junta exited the Council of Europe after being found in violation of the European Convention on Human Rights, judging that the European Commission of Human Rights was "a conspiracy of homosexuals and communists against Hellenic values".

This discourse, promoted by the governments of Hungary and Poland, alleges that LGBTQ rights movements are controlled by foreign forces (such as the European Union) and are a threat to national independence and Western civilization. Anti-government protests in Russia and the Euromaidan have also been portrayed by the Russian government as the work of an LGBTQ conspiracy. Furthermore, although Russia considers itself to be a European country, its government also considers its values as entirely different from those of the European Union. More specifically, Russia has distanced itself from the values of the EU by propagating its own anti-LGBTQ values.

In 2013, the conservative blog American Thinker published several articles using the phrase "LGBT ideology". The Italian Catholic philosopher Roberto Marchesini [it] used the phrase in a 2015 article, equating it with the earlier concept of "gender ideology". In his article, he does not define either "LGBT ideology" or "gender ideology". In 2017, several conservative Islamic politicians in Malaysia and Indonesia denounced "LGBT ideology".

During a sermon on 1 August 2019, Polish Archbishop Marek Jędraszewski called "LGBT ideology" a "rainbow plague" and compared it to the "Red Plague" of Communism. Following this, the Czech cardinal Dominik Duka also commented on "LGBT ideology". However, because Czech society is secular and the Catholic Church has little influence on Czech politics, his comments had little impact. In September 2019, Stanley Bill, a lecturer at Cambridge University who studies Poland, stated "Scaremongering about 'LGBT ideology' has almost become official policy in Poland with often nasty insinuations from members of the government and public media now the norm".

In June 2020, Polish President Andrzej Duda drew international attention when he called LGBTQ an "ideology" and a form of "Neo-Bolshevism". Agreement Party MP Jacek Żalek stated in an interview that the LGBT community "are not people" and "it's an ideology", which led to the journalist Katarzyna Kolenda-Zaleska [pl] asking him to leave the studio; the row caused controversy. The next day, Duda said at a rally in Silesia: "They are trying to convince us that [LGBT] is people, but it is just an ideology." He promised to "ban the propagation of LGBT ideology in public institutions", including schools, similar to the Russian gay propaganda law. On the same day, PiS MP Przemysław Czarnek said on a TVP Info talk show, regarding a photo of a naked person in a gay bar, "Let's defend ourselves against LGBT ideology and stop listening to those idiocies about human rights or equality. These people are not equal to normal people."

In July 2020, the European Union announced that it would not provide funding to six Polish towns that have declared themselves "LGBT-free zones", after nearly 100 local governments, a third of Poland's territory, declared themselves "free from LGBT ideology." On 1 August 2020, the anniversary of the Warsaw Uprising, ultranationalist Robert Winnicki compared LGBT to communist and Nazi ideology. He stated, "Every plague passes at some point. The German plague passed, which was consuming Poland for six years, the red plague passed, the rainbow plague is also going to pass."