The manufacturer's boss, Duncan Aldred, made the confident claim in an interview at the Frankfurt motor show.
"Just after the middle of the decade we expect Vauxhall to be the UK number one," he told journalists.
Currently UK market leader Ford has about a three per cent lead over Vauxhall with a 14 per cent market share compared with Vauxhall’s 11 per cent.
Vauxhall has been closing the market share gap and expects its fresher range of models, including the new Mokka soft-roader and Cascada soft-top, together with the refreshed Insignia to make further inroads into Ford’s market leadership.
"Our mission is to get Vauxhall to the top," added Aldred, "and we have a great product cadence and expect continued sales growth to complete the task."