2011 IRB Junior Player of the Year George Ford - who kicked six successful conversions to help the England U20s record an impressive 59-3 win over Scotland on Friday - makes the shortlist, and is joined by U20 team mate, Worcester Warriors' Matt Kvesic.
Commenting on his inclusion in the final six, nineteen year-old Kvesic said:
"It's a huge honour to make it to the final six for this award, but rugby's not an individual game and there are always fourteen other players giving everything.
"The other nominees are all very talented, I've played England Under 20s with JJ and Fordy so I know about their qualities and I've played against the other lads so best of luck to all involved."
Joining Ford and Kvesic from the Aviva Premiership are Gloucester's Jonny May and London Irish centre Jonathan Joseph.
Twenty-one year old May is selected from a crop of exciting talent at Kingsholm, standing out for his stunning performance against Toulouse in this season's Heineken Cup.
Part of the successful Hartpury Rugby set up in 2008-9, he was a regular feature in the A League side in 2009-10 and made an initial first team squad breakthrough in preseason scoring a memorable try against Connacht.
Joseph, who missed out on an England Saxons call up in February due to injury, completes the English showing in the LV= Breakthrough Player finalists.
Named as London Irish Young Player of the Season in 2010-11, the Derby born centre ran in two tries against Newcastle Falcons at Kingston Park in September 2010 and repeated the feat against Sale Sharks the following month at Madejski Stadium.
The only player on the inaugural shortlist to have been selected in his country's RBS 6 Nations training squad, Wales born Liam Williams has operated at both full-back and wing for the Scarlets.
A product of the Waunarlwydd club he was once likened to JPR Williams by his regional coach, Nigel Davies.
Finally, Matthew Morgan joins the six hopefuls having been named Principality Premiership Player of the Month in his first four weeks at Swansea, before joining Ospreys to make his debut in the LV= Cup victory over Leicester in the 2010-11 season.
The winner of the LV= Cup Breakthrough Player Award is now in the hands of supporters, who can make their choice by visiting www.lv.co.uk/rugby.
The player with the highest number of nominations will receive a Tag Heuer watch plus £1,000 donated to a local grassroots club of their choice and of course, the inaugural LV= Cup Breakthrough Player trophy.
The winner of the award, which is designed to recognise a young player who has stood out in the 2011-12 competition, will be announced on Tuesday March 13. Voting will close at midnight on Sunday March 11.
LV= Breakthrough Player shortlist
George Ford (Leicester Tigers)
Jonathan Joseph (London Irish)
Jonny May (Gloucester Rugby)
Liam Williams (Scarlets)
Matthew Morgan (Ospreys)
Matt Kvesic (Worcester Warriors)