Walter Ariel Bou (born 25 August 1993) is an Argentine professional footballer who plays for Lanús.

[1] Bou started his youth career at Boca Juniors, but was released on a free transfer before debuting with the first team.

[9] On 30 January 2019, Bou joined Chilean Primera División club Unión La Calera, on a one-year loan with option to buy.

[9] On 23 July 2019, Bou returned to Argentina, joining Unión de Santa Fe on a one-year loan.

[12] After a successful loan, he was expected to return to Boca,[13] but on 22 January 2022, he permanently joined Defensa y Justicia, signing a four-year contract.