|Full name||Francisco Javier Castaño Allende|
|Date of birth||29 December 1972|
|Place of birth||Gijón, Spain|
|Height||1.76 m (5 ft 9 in)|
|* Senior club appearances and goals counted for the domestic league only|
He amassed La Liga totals of 121 games and seven goals over six seasons, representing in the competition Sporting de Gijón, Logroñés, Numancia and Betis. He added 150 matches and 23 goals in Segunda División, where he appeared for all the clubs but the first.
Born in Gijón, Asturias, Castaño alternated between La Liga and Segunda División during his first 13 years as a senior. He made his debut in the former competition on 2 June 1991 with Sporting de Gijón, coming on as a 68th minute substitute in a 3–0 home win against RCD Español; he scored his first goal in the Spanish top flight on 27 March 1994, contributing to a 2–1 victory over RC Celta de Vigo also at El Molinón.
Castaño promoted to the top level three times during his professional career, with CD Logroñés in 1996, CD Numancia in 1999 and Real Betis in 2001, netting a combined 17 goals in the process. He also suffered relegation with the second side in 1997.
In 2003, aged nearly 31, Castaño left Levante UD. He went on to play a further 11 seasons in his native region, with Astur CF, UP Langreo, UC Ceares, Marino de Luanco and CD Lealtad, competing in Segunda División B and Tercera División.
In July 2015, Castaño returned to Sporting de Gijón as youth coach.
- Canovas, M. C. (3 June 1991). "Aires de funeral en Asturias" [Funeral march sounds in Asturias]. Mundo Deportivo (in Spanish). Retrieved 29 June 2017.
- Allongo, Jenaro (28 March 1994). "El Sporting se toma un respiro" [Sporting take a breather]. Mundo Deportivo (in Spanish). Retrieved 29 June 2017.
- "Breve enciclopedia numantina" [Brief numantina encyclopedia]. Desde Soria (in Spanish). 29 May 2013. Retrieved 14 October 2019.
- Acedo, Diego (17 November 2011). "Un Castaño sigue floreciendo en Luanco" [A Chestnut ("Castaño" in English) still blossoming in Luanco]. Marca (in Spanish). Retrieved 29 June 2017.
- Fernández, José (29 May 2011). "El Marino regresa a lo grande" [Marino return in style]. La Nueva España (in Spanish). Retrieved 29 June 2017.
- Azparren, Nacho (16 July 2013). "Castaño, la guinda de un ambicioso Lealtad" [Castaño, icing on the cake for ambitious Lealtad]. La Nueva España (in Spanish). Retrieved 29 June 2017.
- Azparren, Nacho (26 May 2014). "Heroico ascenso a Segunda B del Lealtad de Villaviciosa" [Heroic Segunda B promotion of Lealtad de Villaviciosa]. La Nueva España (in Spanish). Retrieved 29 June 2017.
- "Tomás Hervás continúa en el banquillo del Sporting B e Isma Piñera será el segundo entrenador" [Tomás Hervás remains in Sporting B's bench and Isma Piñera will be the second coach] (in Spanish). Sporting Gijón. 9 July 2015. Retrieved 29 June 2017.