Peter Mauchan (1882 – 5 November 1943[1]) was a Scottish footballer who played for Spanish club FC Barcelona at the turn of the century.

[4] Because of this, Peter would rarely be tackled by the opposition, as they feared his father's red card, and in fact, his father was the first referee in Spanish football to show one when on 11 February 1900, in a clash against FC Barcelona, he sent off Barça's Englishman Stanley Harris after a foul on his fellow countryman Willie Gold, who was also sent off after throwing a punch on Harris.

[5] Mauchan was noted as being both incredibly strong and having great skill with the ball, especially in comparison to the young locals of Barcelona at the time.

[6] For this reason, during his time at Barça, he played as a defender on the left wing, and in his first season, he played seven games, scoring twice,[3][6] including one goal at the first edition of the Copa Macaya in 1901, which came in an 18–0 trashing of Club Tarragona, thus contributing in Barça's biggest victory at the tournament, which ended in a runner-up finish to Hispania AC.

[7][a] Peter retired from football shortly after, but due to his immense love for the game and following the influences of his father and John Hamilton before him, he became a referee.