The Wales coach has predictably named an unchanged team after his players pushed world champions South Africa to the brink of defeat in Wellington last Sunday.
It is the first time since 2006 that Wales have retained the same starting XV in successive Tests.
One switch on the replacements' bench sees a potential return to action for Cardiff Blues prop Gethin Jenkins, who takes over from Ryan Bevington.
British and Irish Lions Test loosehead Jenkins has not played for Wales since they faced New Zealand in Cardiff 10 months ago.
A calf muscle injury has sidelined him throughout this year, but Gatland opted to select him in his 30-man World Cup squad due to his proven pedigree and vast experience of 76 caps.
The 30-year-old has trained with the squad this week and his presence considerably enhances Wales' front-row options as they approach pivotal Pool D appointments with Samoa, Namibia and Fiji.
Wales' 17-16 loss to the Springboks means they are now in a knockout situation, knowing another defeat would effectively rule them out of quarter-final contention.
But Gatland will hope his side can reproduce the quality of their display against South Africa, when big-name players like Jamie Roberts, Mike Phillips and skipper Sam Warburton all delivered world-class performances.
"We were extremely disappointed to lose last week against the Springboks," he said.
"But we did maintain momentum, with aspects of the performance providing a host of positive points to take into Sunday against Samoa.
"We have regrouped and the players are looking forward to getting back out on the pitch to largely pick up where they left off last weekend.
"There are one or two areas we know we need to work on, but we are looking for much of the same from all involved.
"We could not fault the effort, passion and commitment of the players last week, and we have simply said we are looking for the same again against Samoa."
Wales will make their first World Cup appearance in Gatland's home town of Hamilton. During his playing career, Gatland made 140 appearances for Waikato and coached them to Air New Zealand Cup success five years ago.
"Samoa are going to have a lot of support, as will Fiji when we come back to play them in the final game of our pool," he added.
"But we are hoping some of the Waikato people will be getting behind Wales as well.
"We played there on our summer tour of New Zealand last year and I told all of the players what to expect then. We all really enjoyed the experience and the welcome we had in Hamilton."
Samoa opened their World Cup campaign with a 49-12 success against Namibia two days ago and have made one change from that game, with blindside flanker Ofisa Treviranus replacing Taiasina Tuifua.
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