Ms Harris delivered her remarks at Howard University in Washington DC, her alma mater and one of the country’s most prominent historically black schools, in the same spot where she hoped to give a victory speech.
“While I concede this election, I do not concede the fight that fuelled this campaign,” she said.
Her running mate, Minnesota governor Tim Walz, was in the audience along with Nancy Pelosi, the former House of Representatives speaker.
Before her speech, Ms Harris called Mr Trump to concede the election and congratulate him on his victory. She said: “We will engage in a peaceful transfer of power.”