Louis will share his baptism location with George, but Charlotte, on the other hand, was baptized at the Church of St. Mary Magdalene in Sandringham.
Prince Louis, like his siblings, is likely to wear a replica of the 172-year-old Honiton Robe for the ceremony.
"Prince Louis will be christened by The Archbishop of Canterbury, the Most Reverend Justin Welby", the Palace said.
Britain's royal palace says Prince Louis will be christened July 9 by Archbishop of Canterbury Justin Welby.
Sister Princess Charlotte was also christened about two months after Kate gave birth to her.
As of Wednesday, we know what's next up on the royal schedule that'll draw the family together once again: Prince Louis's christening. It was the setting for Queen Victoria's wedding in 1840 to Prince Albert.
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It's the quickest christening out of all of the Duke and Duchess' children. The date fits in perfectly with Prince Harry and Meghan's busy schedule as it falls one day before their official two-day visit to Dublin.
The royal family will gather at The Chapel Royal next month to celebrate the christening of their newest family member. The Duke and Duchess of Cambridge will share photos but will keep the occasion as private as possible.
The little prince, the younger brother of Prince George and Princess Charlotte, will be baptized in the Chapel Royal at St James's Palace.