The Ospreys are the best represented with five forwards - Adam Jones, Richard Hibbard, Alun Wyn Jones, Ian Evans and Justin Tipuric - all selected for the trip.
In 2009 the Ospreys had six representatives, in 2005 they had four, and Tandy believes it is tribute to the region to be have a strong contingent once more.
"Today is about the players that have been selected for the trip and the nation will be united in sending our congratulations out to each and every one of them," said Tandy.
"We are delighted that so many of our players have once again been selected for Lions duty, which is the highest possible accolade for a British and Irish rugby player.
"Their involvement on this tour is recognition, not only of them, but of the work done to help develop them all the way from playing for their community club as a child, through the regional development system into senior rugby with the Ospreys, and everyone who has worked with them along the way should be incredibly proud of the part they've played.
"In our short history, the Ospreys have already developed a proud tradition of supplying players to the Lions, with ten regional representatives on the last two tours, the largest of any region.
"That we are able to make such a contribution again this time, despite four of our six 2009 representatives having moved on with two of those once again included this time around, is testament to the ongoing work being done at the Ospreys, day in, day out, to develop players of the highest quality."
Cardiff Blues: Leigh Halfpenny, Alex Cuthbert, Jamie Roberts, Sam Warburton
Newport Gwent Dragons: Toby Faletau, Dan Lydiate
Ospreys: Adam Jones, Richard Hibbard, Ian Evans, Alun Wyn Jones, Justin Tipuric
Scarlets: Jonathan Davies, George North
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