William Parsons Alexander

William Parsons Alexander (19 January 1877 – Unknown) was an Anglo-Spanish footballer who is best known for being, along with his brother John, one of the founders of FC Barcelona in 1899. He served as the club's vice-captain in 1899 and 1900 , though he never played a match for the club. He was also one of the founders of the Real Club de Tenis Barcelona. He was known in Catalonia as Guillermo, which was a rendering of his English name into Spanish.

Sociedad de Foot-Ball de Barcelona Together with his brother John, he was one of the first pioneers of football in Catalonia, joining Sociedad de Foot-Ball de Barcelona in 1895, a team made up of a group of football pioneers who had been playing in Catalonia since 1893. On 2 February 1895, he played a match for Barcelona against Asociación de Foot-Ball de Torelló, which was the very first time that teams from two different cities played against each other in Catalonia, and he rose to the occasion,

Parsons played several friendly matches at Can Tunis and a few others at Bonanova between 1892 and 1895, where he stood out as a great goal scorer, however, due to the little statistical rigor that the newspapers had at that time, the exact number of goals he netted is unknown. Despite some encouraging first steps, this society was never officially established and when its founder and captain James Reeves returned to the United Kingdom in the autumn of 1895, it was the Catalans and the Parsons brothers who took the reins of the team, but without Reeves, the entity soon declined, collapsed and seems to disappear around 1896. However, in Barcelona's official debut on 8 December 1899, the two Parsons brothers played for the rival team, Team Anglès, which consisted of members of the British colony living in Barcelona, such as the two of them and the Witty brothers (Arthur and Ernest), helping Anglès to a 1–0 win.

Five days later, on 13 December 1899, the Blaugrana team merged with the Team Anglès, which led to the expansion of Barça's board of directors with his brother John becoming the vice-president of the club while still being a footballer, and William was appointed the vice-captainancy of the team. However, he never managed to defend that responsibility on the playing field because in February 1900, he left for Manila for family reasons, leaving the vice-captaincy of Barcelona in the hands of Ernest Witty.