Amadou Ba Zeund Georges Mvom Onana (born 16 August 2001) is a professional footballer who plays as a defensive midfielder for Premier League club Everton. Born in Senegal, he plays for the Belgium national team.

Onana joined 2. Bundesliga club Hamburger SV in mid-2020. He made his professional debut for the club in the first round of the 2020–21 DFB-Pokal on 14 September 2020, coming on as a substitute in the 60th minute against 3. Liga side Dynamo Dresden. He scored a header in the 89th minute of the match, which finished as a 4–1 away loss.

In August 2021, Onana joined Ligue 1 club Lille on a five year deal. He made 32 league appearances in 2021–22, scoring once.

Onana signed for Premier League club Everton on a five-year contract on 9 August 2022 for a reported £33m including add-ons. He scored his first Premier League goal for Everton, a header from a corner, in a 2–1 home defeat against Southampton on 14 January 2023. On 19 December 2023, Onana missed what would have been the winning penalty for Everton in their 2023–24 EFL Cup quarter-final against Fulham. With the penalties standing at 4–3 in Everton's favour, Onana attempted a penalty with no run up. Onana proceeded to pass the ball along the ground past Fulham goalkeeper Bernd Leno who easily saved the attempt. Fulham would go on to win 7–6 in the penalty shootout.

On 18 May 2022, Onana was named in the Belgium senior squad for the four 2022–23 UEFA Nations League matches in June 2022 against Netherlands, Poland (twice) and Wales respectively. Onana made his full international debut against the Netherlands on 3 June 2022.

On 10 November 2022, Onana was named in the final 26-man squad for the 2022 FIFA World Cup in Qatar. He made two appearances at the tournament, appearing as a substitute in the first group game against Canada and starting against Morocco in the second. He was suspended for Belgium's final match, as the team drew 0–0 with Croatia and were eliminated.