Wadera is one of the woredas in the Oromia Region of Ethiopia.
It was part of former Adolana Wadera woreda.
The largest town is Wadera.
The 2007 national census reported a total population for this woreda of 50,554, of whom 25,670 were men and 24,884 were women; 4,729 or 9.35% of its population were urban dwellers.
The majority of the inhabitants said they were Muslim, with 64.18% of the population reporting they observed this belief, while 26.62% of the population were Protestant, 4.78% practised Ethiopian Orthodox Christianity, 2.62% practiced traditional beliefs, and 1.11% were Catholic.