Sopuruchukwu Bruno Onyemaechi MON (// ⓘ; born 3 April 1999) is a Nigerian footballer who plays as a left-back or centre-back for Super League Greece club Olympiacos[1] and the Nigeria national team.

In the winter of 2018, Onyemaechi was trialed by clubs in Norway, which used player agent Atta Aneke.

Onyemaechi was brought to Lillestrøm's Marbella training camp and played friendly games, but ended up not being signed.

[2][3] On 17 August 2022, Onyemaechi joined Boavista on a season-long loan with an option to buy.

[6] On 10 September 2023, Onyemaechi made his international debut for Nigeria, playing as a left-back for the full 90 minutes of a 6–0 victory over São Tomé and Príncipe, in the final group match of the 2023 Africa Cup of Nations qualifiers.