One man said he had clients who had captured children and taken their blood and body parts to his shrine, while another confessed to killing at least 70 people including his own son.
A witch-doctor in northern Uganda, said clients came to him in search of wealth.
“They go and capture other people’s children. They bring the heart and the blood directly here to take to the spirits,” he said.
“They bring them in small tins and they place these objects under the tree from which the voices of the spirits are coming.”
The witch doctor, who said he was paid 500,000 Ugandan shillings (around £160) for a consultation, denied any direct involvement in murder or incitement to murder, saying his spirits spoke directly to clients.
Uganda’s government claimed human sacrifice was on the increase.
According to officials trying to tackle it, the crime is directly linked to rising levels of development and prosperity – and an increasing belief that witchcraft can help people get rich quickly.