LONDON — A United Nations expert warned on Tuesday that human rights advocates in Hungary faced threats and political pressure, citing “attempts to silence dissenting voices” in a country that has taken a sharp right-wing turn since 2010.

“They face enormous pressure through public criticism, stigmatization in the media, unwarranted inspections and reduction of state funding,” the expert, Michel Forst, the special rapporteur on the situation of human rights defenders, said after a weeklong official visit to Hungary.

In a statement, Mr. Forst spoke of the pressures faced by human rights advocates and joined critics of Prime Minister Viktor Orbán’s conservative government, saying its policies had “weakened a well-functioning democracy.”

The statement said that defenders of women, ethnic minorities and the gay and lesbian community were particularly vulnerable, as well as whistle-blowers, investigative journalists and advocates for refugees.