Ward has agreed a four-year contract at Leicester after moving for an undisclosed fee, subject to Premier League approval.
“I’ve come here to develop my all-round game and hopefully help deliver some more success," he told Leicester's official website.
The 25-year-old made two Premier League appearances for the Reds, both of them coming in 2015/16.
He went on to represent Wales at UEFA Euro 2016 as they reached the semi-finals.
Ward then helped Huddersfield Town win promotion to the Premier League, playing 46 matches for the Terriers during a season-long loan in 2016/17.
He played one first-team match for Liverpool last campaign, facing his new club Leicester in a Carabao Cup tie at King Power Stadium.
Photo: Plumb Images/LCFC