The Duke and Duchess of Sussex posted the photo on their Instagram account Sunday - showing Archie holding on to Prince Harry's finger. And, in honor of the occasion, the Duke of Sussex is posting an adorable photo of himself and the new royal sharing a sweet father-son moment on Instagram.
Last month, the Duchess of Sussex - who is American - celebrated her first US Mother's Day by sharing a picture of Archie's feet.
The baby hadn't yet been born when the United Kingdom had its Mother's Day this year.
"Happy Father's Day!" reads the caption.
Archie was born at The Portland Hospital in London on Monday, May 6.
The first was for Meghan Markle's first Mother's Day.
The couple also kept their son's place of birth under wraps for a few weeks, until his birth certificate was released by Buckingham Palace.
Happy Father's Day, Harry!
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Earlier today, Prince William was seen playing with Prince Louis in a photo shared to celebrate Father's Day.
In a message on the Clarence House Twitter page, Charles shared good wishes with "Dads everywhere" alongside an image of him with his two sons.
It is not yet known if Harry and Meghan will bring baby Archie with them.
One showed him in his father's arms during the official photocall at Windsor Castle.
Meghan and Harry are also said to have tried to keep Archie's birth certificate private in a break from royal protocol.
He said: "He seems to be really, really happy so I'm very happy and excited for him".
Harry previously spoke about his desire to start a family, saying: "I've longed for kids since I was very, very young".