It said in a statement: “The Bishop of Lincoln, the Right Rev Stephen Conway, has been suspended from ministry while a complaint made to the National Safeguarding Team is responded to according to House of Bishops Code of Practice.
“This includes referral to the appropriate statutory authorities.”
No details of the complaint were given.
The Bishop of Grantham, the Right Rev Dr Nicholas Chamberlain, will take over diocesan duties during the suspension, the statement said.
The Diocese added: “Support is in place for those affected and there will be no further comment while the process is ongoing.
“We understand that this will be a deeply unsettling time. The Diocesan Safeguarding Team is available for anyone who wishes to contact them.”
Conway was installed as Bishop of Lincoln in 2023, previously having served as Bishop of Ramsbury and Bishop of Ely.
He has been a member of the House of Lords since 2014.