The outsourcing scheme comes as the force battles to meet Government-imposed cuts of 20% to its £3.5 billion budget by 2016.
The MPS said it recognises there is an "irreducible core" of policing services that must continue to be kept in-house, such as patrolling, emergency response and investigations.
It said beyond this there are areas that could be delivered through re-tendering and outsourcing.
Under the plans, finance, HR, procurement, catering, healthcare provision and language services will be opened up to external bidders.
Deputy commissioner Craig Mackey said the more money the MPS can save the more officers it can devote to frontline policing.
"We're trusted to provide the best value for money service. If there is an opportunity to improve how we work or cut costs, without making the thin blue line thinner, we want to explore it," said Mackey.
"The process will assess quality and value and not just seek to cut costs and we expect the great people in our existing in-house teams to be able to demonstrate the value and quality they already deliver."
The MPS confirmed it will begin market testing next year with a view to place subsequent contracts with private firms from 2015 onwards.
