The 23-year-old joins the Club from Athletic Bilbao as Pep Guardiola’s sixth signing of the season and has signed a deal until 2023.
Regarded as one of the most promising young defenders in Europe, Laporte will take the number 14 shirt and is eager to help the Blues in their hunt for silverware.
“I am very happy to be here,” Laporte declared. “City are a Club with a lot of ambition and they are one of the best teams in Europe.
“I am looking forward to working under Pep Guardiola and trying to help the Club to achieve success.
“It means a lot that the Club have shown faith in me and I am excited to get started.”