Arnau Ortiz Sánchez (born October 29, 2001, in Figueras, Gerona) is a Spanish footballer who plays as a left winger, currently a member of Atlético Madrileño. His career began in the youth ranks of CF Peralada, and after two seasons there, he joined Girona FC "B" in 2021, where he scored 3 goals in 15 matches and was called up to the first team on four occasions.

In 2022, he had brief stints with Peña Deportiva and a loan to Real Murcia, before being loaned to CD Eldense in the Segunda División in July 2023. After a difficult first half of the season at Eldense (playing only 425 minutes in 11 games), his loan was cancelled, and he finished the season on loan at FC Cartagena.

Following a spell in Poland with Śląsk Wrocław, he signed for Atlético Madrileño—the team managed by Fernando Torres—on September 1, 2025, marking an exciting new chapter in his career.