Access to Facebook, Messenger, TikTok and Telegram was severely restricted, NetBlocks said in statement late on Thursday, citing network data it had collected.
Ethiopian government spokesperson Legesse Tulu did not immediately respond to requests for comment on Friday. The government said in a statement on Thursday that the upcoming protest was banned to prevent violence.
The protests broke out in the Oromiya region when three church officials declared themselves archbishops last month and set up their own governing body. Some demonstrators have opposed their move while others have supported it.
At least 30 people have been killed in protests since Feb. 4, the church said in a statement on Thursday.
Ethiopian authorities have previously shut down or restricted access to the internet during periods of political unrest, including in response to protests in 2020 that followed the killing of a popular singer from Oromiya.
Internet and phone communications were also shut down in the northern Tigray region for most of a two-year war that ended in a ceasefire in November.