The group were chosen following a cook-off in two regional finals held simultaneously at University College Birmingham and the University of West London, Ealing on 8 March.
Three of the finalists work across Simon Rogan’s restaurants L’Enclume in Cumbria and Roganic in London.
Rogan tweeted that he was “so proud” of the team, and that it was "a fantastic achievement”.
Judges included Angela Hartnett, Clare Smyth, Rachel Humphrey, Andrew Fairlie and Michel Roux Jr.
The six finalists will go on to compete in the final in London on 26 March, with the 2018 champion announced at a ceremony at The Langham, London that evening.
The winner will receive a £6,000 prize and an all-expenses paid three-month stage at a three-Michelin-starred restaurant anywhere in the world.
The Roux Scholarship was founded in 1984 and is overseen by the Roux family, with previous winners including Sat Bains (1999), Simon Hulstone (2003) and Andre Garrett (2002).
The 2018 finalists are:
Martin Carabott – 85 Piccadilly, London
Ben Champkin – L’Enclume, Cumbria
Oliver Marlow – Roganic, London
Sam Nash – L’Enclume, Cumbria
Ryan Porter – Northcote, Lancashire
Fergus Wilford – Cliveden House, Berkshire