Juan Arza Iñigo (12 June 1923 – 17 July 2011) was a Spanish football forward and manager.

He spent the majority of his career with Sevilla, appearing in 414 official games over the course of 16 La Liga seasons (207 goals, best-ever in the club's history), and also managed his main team on several occasions.

Born in Estella-Lizarra, Navarre, Arza's first club was hometown's CD Izarra. He moved to neighbouring Deportivo Alavés (Basque Country) subsequently, then to CD Málaga, staying for a season with the latter team.

In 1943, aged 20, Arza continued in Andalusia and joined Sevilla FC, where he had his most enduring and successful spell, scoring an hat-trick on his official debut, a 5–2 home win against CE Sabadell FC on 26 September, and netting 57 in his first four seasons combined - in 1946, the club won its first ever La Liga championship, with the player contributing with 14.

Dubbed El Niño de Oro ("The Golden Boy"), Arza scored a career-best 29 goals in the 1954–55 season, good enough for his first and only Pichichi Trophy. After only seven games in 1959–60, the 36-year old left Sevilla to join Atlético Almería, and retired a year later. He went on to coach his main team as an interim on several occasions, not being able to prevent top flight relegation in 1967–68, after 12 games in charge; he also worked with the club as match delegate in the 80's and 90's and, as a coach, was also namely in charge of Celta de Vigo (five separate seasons, four in the top division).

Arza (Tibetan: ཨར་རྩ།, Wylie: ar rtsa, ZYPY: Arza; Chinese: 阿扎; pinyin: Āzhā) is a small populated town and township, east of Lhasa in the Tibet Autonomous Region of the People's Republic of China. It belongs to Lhari County (Jiali Xian) of the Nagqu Prefecture. It contains solar panels.