The pictures were taken by British photographer Matt Holyoak at Clarence House after Louis was baptised in The Chapel Royal at St James’s Palace last Monday.
In one photo, the Duke and Duchess of Cambridge are joined by their children, along with the Duke and Duchess of Sussex and the Prince of Wales and the Duchess of Cornwall.
The Middleton family including Kate’s sister Pippa Matthews and her husband James, are also included in the photos, which were taken in the morning room and garden at Clarence House.
Members of the Royal Family appear in another photo without the Middletons, while a third photo features just the Cambridges and the fourth photo is an image of just Kate and son Louis.
Unofficial photos were taken on the day of the ceremony and showed the Duke and Duchess together with all three of their children for the first time.
Speaking after the official shoot, Mr Holyoak said: “I was truly honoured at being asked to take the official photographs at the christening of Prince Louis, and to witness at first hand such a happy event.
“Everyone was so relaxed and in such good spirits, it was an absolute pleasure.
“I only hope I have captured some of that joy in my photographs.”
Louis was sound asleep as he was carried into the chapel by his mother for the christening ceremony which lasted 40 minutes.
Then only eleven weeks old, Louis was dressed in a white lace, satin-lined christening gown.
It is a replica of the royal christening robe, first worn in 1841.
Reproduced by dressmaker to the Queen Angela Kelly, it was worn by his older siblings, George and Charlotte at their christenings.
After the ceremony, the baby prince looked content and wiggled his fingers as Kate gazed down and beamed at him as she held him in her arms.
Twelve-week-old Louis, who is fifth in line to the throne, has six godparents.