His Christening will take place on July 9 at the Chapel Royal at St James's Palace.
Justin Welby, the Archbishop of Canterbury, will perform the christening in a private ceremony that will last around half an hour.
The fifth in line to the throne will be christened in the same chapel as his older brother Prince George.
Princess Charlotte's christening took place in Sandringham.
The prince's godparents are yet to be announced but there is some speculation that Meghan Markle could be asked to be his godmother.
The bookies' favourites are Miguel Head and Tiggy Legge-Bourke.
Mr Head is Prince William's long standing private secretary and is due to leave his post next month. While Ms Legge-Bourke is Prince William's childhood nanny.
The odds for both currently stand at 2/1.
Both Princess Eugenie and Princess Beatrice currently stand at 7/1 on becoming godmothers.
The Duke and Duchess of Cambridge are pleased to announce that the christening of Prince Louis will take place on Monday 9th July at The Chapel Royal, St James’s Palace, London.— Kensington Palace (@KensingtonRoyal) June 20, 2018
Prince Louis will be christened by The Archbishop of Canterbury, the Most Reverend Justin Welby. pic.twitter.com/aBGNYTMRri
Prince George has seven godparents and Princess Charlotte has five godparents. The Duke and Duchess of Cambridge have mostly chosen their friends or cousins to be their childrens' godparents.
The Duke and Duchess of Cambridge's third child was born at the Lindo Wing of St Mary's Hospital, Paddington on April 23 at 11.01am weighing 8lb 7oz.
His full name is Louis Arthur Charles of Cambridge.
Prince Louis's name was the subject of much speculation last week as the couple kept the world waiting for four days before it was finally announced.
Albert and Arthur were among the bookies' favourite for the royal.
His chosen name has family ties as Louis Mountbatten was the uncle of Prince Phillip and last viceroy of India.