John Carleton, a former PricewaterhouseCoopers director, joined Local Partnerships in November last year, but will now leave immediately and will not be working his notice period, the body said in a statement.
Claire Phillips will be acting chief executive until 31 August when Mike Gerrard, currently chief executive of Partnerships UK, will become interim chief executive.
Local Partnerships was launched in August 2009. It is a joint vehicle between Partnerships UK, the public-private body that advises central government on procurement, and the Local Government Association. It incorporates the 4Ps service that advised councils on public-private partnerships.
At the end of last year the Government announced that Infrastructure UK – a new Treasury advisory body – would take over the functions of Partnerships UK that supports the delivery of major projects and programmes.