Casa Pia Atlético Clube is a Portuguese multi-sports club founded in 1920 and based in Lisbon, Portugal, best known for its professional football team, that competes in the Primeira Liga.

Casa Pia AC was one of the most versatile Portuguese clubs, having played 25 sports, with the curiosity of having been the only one who practiced Baseball regularly, beating the strong team of the American Colony on 4 July 1923 at Campo das Laranjeiras by 25–24.

[1] On 18 December 1921, when Portugal made their international debut against Spain in Madrid, Casa Pia FC provided the squad with four players in a 1–3 loss, including Cândido de Oliveira, who was the team captain.

The trip to Seville took place on 16 October 1921, on the occasion of the inauguration of the Campo de Sports on Avenida de la Reina Victoria, facing Sevilla FC, who was wearing its current emblem on their chests for the first time, and despite the injury suffered by Spencer, who was forced to leave the pitch for much of the match, Sevilla FC achieved a clear victory over the Casapianos, prevailing by three goals to nil, goals scored by León, Kinké and Escobar.

[5] Oliveira was the main architect of the team's rise to football power in Lisbon, competing head-to-head against the likes of Benfica and Sporting CP, and largely thanks to his quality, the immediate impact of Casa Pia continued to be felt in the following seasons.

[5] The reputation grew and, on 13 December 1925, the club was invited to face Benfica on the occasion of the inauguration of Estádio das Amoreiras, which was considered at the time the best stadium in the Iberian Peninsula.