Tadeo Allende (তাদেও আয়েন্দে) is an Argentine professional footballer who plays as a winger for Major League Soccer club Inter Miami on loan from Spanish club Celta de Vigo. Allende also holds an Italian passport.

Born in Mina Clavero, Córdoba, Allende began his career with hometown side CA Juventud Unida before joining Instituto's youth sides in 2017; initially a striker, he would progress in the youth categories as a winger. In March 2021, he signed his first professional contract with the latter club, being promoted to the first team.

Allende made his senior debut on 13 March 2021, starting in a 0–0 Primera Nacional away draw against Defensores de Belgrano.

On 20 January 2022, Allende moved to Primera División side Godoy Cruz on a one-year loan deal, with a buyout clause. He made his debut in the category on 11 February, starting in a 1–1 home draw against Tigre.

On 14 June 2022, Godoy Cruz bought 50% of Allende's economic rights for a rumoured fee of US$ 300,000, with Allende signing a contract until 2026. He scored his first professional goal on 2 July, netting the winner in a 1–0 home success over Colón. A regular starter during the 2023 season, Allende scored ten goals during the year, only missing out a few matches due to a knee injury.

On 31 January 2024, Allende signed a four-and-a-half-year contract with Spanish La Liga side Celta de Vigo.

On 14 January 2025, Allende was loaned to Major League Soccer side Inter Miami for their 2025 season. He emerged as one of the leading offensive players for Miami, finishing the regular season with 11 goals and one assist, often starting along Lionel Messi and Luis Suárez.