Sevilla had a golden late chance to force extra-time when former Barca player Aleix Vidal was fouled by Ter Stegen in the 89th minute, but substitute Wissam Ben Yedder struck his penalty softly along the ground and the towering German goalkeeper comfortably caught the ball.
Dembele scored the victor in the 78th minute after Gerard Pique had cancelled out Pablo Sarabia's opener as Barca beat Sevilla 2-1 in Tangier, Morocco.
Sevilla made the breakthrough in the ninth minute of the match, although it would have been disallowed but for the invention of VAR, which showed that the linesman was wrong to flag Sarabia offside.
The match had endured a controversial build-up when Sevilla threatened to file a complaint against Barcelona if the La Liga champions fielded more than three non-EU players.
Ousmane Dembele scored a late winning goal with a blistering strike from outside the area.
The Catalans were given a much tougher time from the Andalusians than in the Copa del Rey final and met a narrow, determined team who have quickly been whipped into shape by new coach Pablo Machin and who went ahead early on through Pablo Sarabia after a barnstorming run by Colombian forward Luis Muriel.
The Barcelona equaliser did arrive before the break, however, with Pique converting from close range after Messi's free kick had come back off the post and hit Vaclik before dropping into a risky position.
The first serious attempt of the second period came from another Messi free kick just before the hour, but Vaclik did well to make the stop.
Sevilla then hit the crossbar from Franco Vazquez's looping header as both sides pushed for victory.
There was more action to come, with Ben Yedder's miserable penalty, but Barca - who handed debuts to Clement Lenglet, Arthur and Arturo Vidal - win for the sixth time in nine years. Barcelona picked up an unprecedented 13th Supercup trophy to start off the 2018/19 campaign on a positive note.
The group's head of delegation in Yemen, Johannes Bruwer, tweeted "scores killed, even more injured, most under the age of 10". He also accused the Houthis of recruiting children and using them in the battlefields to cover for their actions.
Saudi Arabia's Foreign Ministry called the statement " a major, unacceptable affront to the kingdom's laws and judicial process ". Still, Rai said the impact on the currency should be "ephemeral" as bilateral trade between Saudi Arabia and Canada is small.
Collins was one of President Trump's earliest congressional supporters, becoming the first member of the House to endorse Mr. Collins was indicted on charges that he used inside information about a biotechnology company to make illicit stock trades.
For now, Camel directed current Diablo III players to the game's 14th Season, the " Season of Greed ". Each time there is a slight inkling that new Diablo projects are in the works, I'm straight on it.
The Energy Information Administration is scheduled to release the data on US crude stockpiles, at 10:30 AM ET on Wednesday. Energy Information Administration reported a surprise build of 3.8 million barrels in commercial crude oil inventories .
He was arraigned today on a misdemeanor assault charge and released on his own recognizance after entering his plea. A Florida tourist died in NY after he was punched by a man he probably thought was an Uber driver, his family said.
The First Lady wears an nearly "naked" dress while accompanying her husband to the North Atlantic Treaty Organisation summit. The Times noted that the couple would have to have their green cards for five years to become eligible for citizenship.
The Note 9 will get double the storage, at 128 gigabytes, compared with typical high-end phones, including the iPhone X. Fortnite was finally announced for Android today, but as an exclusive to Samsung Galaxy devices for the time being.
President Donald Trump says the United States has chose to increase tariff rates on Turkish steel and aluminum . He added that the country will continue to enjoy good economic relations with several major nations.
On Tuesday , Gates did connect one part of the bank fraud charges against Manafort to his role in the Trump campaign. Vincent and the Grenadines. "WTF", Mr Manafort wrote in response, "How could I be blindsided like this".
Aretha Franklin, Queen of Soul, Reportedly Gravely Ill
Veteran entertainment reporter Roger Friedman of Showbiz 411 says the singer's family are "asking for prayers and privacy". Franklin won her first Grammy Award in her mid-20s, going on to win an additional 19 gongs throughout her career.
California's Holy Fire prompts state of emergency
Before his arrest, Clark told a freelance cameraman he was asleep when the fire started and had no idea how it began. Clark, who is being held on $1 million bond, is slated to appear in court Thursday (Friday NZT), records show.
Fantasy Cricket: Dream11 tips for 2nd Test-- England v India
Chris Woakes will come in if England opt for a further seam option, while Moeen Ali will play if the hosts plump for two spinners. It is the first time a whole Test match day has been lost to the weather at the home of cricket since May 2001, against Pakistan.
Donald Trump says tariffs 'working big time'
Chinese authorities - bracing for economic fallout - have taken a range of measures in recent weeks to bolster the economy . Beijing recently slapped additional duties ranging from five to 25 percent on $60 billion worth of American goods.