The couple announced their exciting baby news with a sweet Instagram post on Valentine's Day.
The caption to their picture was "Happy Valentine's Day".
The couple, who tied the knot in May a year ago, haven't shared anymore details about the pregnancy.
"A very happy #ValentinesDay from ours to yours", he wrote. I'm so happy for you guys!
Daley and Black married past year on May 6 at Bovey Castle, having announced their engagement on October 1 2015.
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The news comes six months after Tom told the Belfast Telegraph they would love to start a family, saying: 'Lance and I definitely want a family in the future - who knows when? "Who knows when? We're both lucky to have supportive families".
And a fourth chimed in: "OMG congratulations you're going to be the most ideal parents, I'm so happy for you". "We want to share that with our own children".
But this was NOT the case forTom Daley and his husband Dustin Lance Black.
"Marriage is the foundation to all of these other big plans we have", Black added.
Dustin won the Academy Award for Best Original Screenplay in 2009 for the movie Milk, based on the life of gay rights activist Harvey Milk.
The pair have been dating since meeting at an industry party in 2013, and got engaged two years later in 2015.