Sister company Europcar will also follow suit.
The move, says National, is to improve car availability through fleet sharing.
Fleet managers will benefit from greater car accessibility and a wider choice from the 260 National and Europcar offices.
“Most of our fleet customers have a delivery and collection service so they never see where the car comes from, which makes branding an irrelevance,” explained John Leigh, managing director of National and Europcar.
“It means there will be more cars around for customer needs – and we think that’s want our customers want.”
He said fleet sharing was one of the efficiencies identified following Europcar’s March acquisition of Vanguard Rental’s interests in the European operations of National Car Rental.
Another has been the integration of contact centre functions at National’s Leicester facility.
However, while fleets would be shared without branding, in future branches would be dual branded where they served both sets of customers.
Fleet managers buying from Europcar would continue to use its Greenway online booking system; National customers the carhirebooker.com or Speedlink sytems.
“At this stage we don’t want to confuse our customers, nor do we want to lose the benefits of such well-established brands,” said Mr Leigh.