Spicer is a familiar face in Washington, as the longtime chief spokesman of the Republican National Committee.
Also named to top White House press posts were: Jason Miller, who was named director of communications; Dan Scavino, director of social media, and Hope Hicks, director of strategic communications.
"Sean, Hope, Jason and Dan have been key members of my team during the campaign and transition," Trump said in a statement from his Mar-a-Lago estate in south Florida, where he is spending the Christmas holidays.
"I am excited they will be leading the team that will communicate my agenda that will Make America Great Again," the president-elect said.
The New York Times reported that Trump had hoped to persuade his former campaign manager Kellyanne Conway to at least share thepress secretary podium -- but that she declined.
Conway was rewarded Thursday for her key role Trump's successful campaign with a White House post as counselor to the president-elect.