Alex Greenwood, Chloe Kelly, Laura Coombs and Lauren Hemp all featured for the European champions as they, like in their opening fixture against Haiti, held on to an early lead despite a few late scares.
It was a dream start for Sarina Wiegman’s side, with Lauren James curling home a sumptuous opener from the edge of the box inside six minutes.
That strike set the tone for a dominant opening 25 from the Lionesses, who looked much more like their usual selves after an off-colour performance in their first match of the tournament.
But the Danes, fresh from a late victory over China, weren’t there to make up the numbers, with Rikke Madsen firing just wide after turning smartly away from the attentions of Greenwood inside the area midway through the first half.
Mary Earps was called into action soon after when she made a smart save at her near post to deny Pernille Harder after a lightning counter attack, but England went close again on the half hour when Lucy Bronze headed onto the roof of the net having been picked out by Kelly.
The sight of Keira Walsh being stretchered off with a suspected knee injury, however, brought a breathless opening 45 minutes to a sudden halt, dampening what was otherwise a positive showing from the European Champions early on.
Laura Coombs was introduced in Walsh’s place to make her World Cup debut and slotted in seamlessly to the midfield as England looked to gain a foothold on proceedings against a fiercely competitive Denmark side.
The second 45 began in a similar fashion to the first with England on the front foot, and Ella Toone sliced over early on from another dangerous set-piece situation.
Denmark were far from out of the contest though, and Greenwood had to be at her best to make a decisive sliding challenge after a loose pass from Millie Bright had almost presented Madsen with a clear run on goal.
With clearcut chances at a premium following that early flurry, Alessia Russo was frustrated not to make more of a burst into the box when she sliced wide of the near post, while Earps was at full stretch to palm away a speculative cross from Katrine Veje.
The Lionesses were looking to put the game to bed in the final 15 minutes and introduced Hemp to the fray in search of that elusive second strike.
It almost had the desired effect when the winger combined with Rachel Daly down the left, before the latter’s ball into the box was flicked just over the bar by substitute Beth England.
The biggest chance of the second half fell to the Danes though, when Amalie Vangsgaard’s header came crashing back off the post late on after she’d beaten Daly to an inviting cross.
However, as they did against Haiti on Saturday, the Lionesses held on to claim all three points and edge closer to the knockouts.
They will be guaranteed of a spot in the Round of 16 should China fail to beat Haiti later today, and will finish top of Group D should they avoid defeat in their final fixture on Tuesday 1 August.
