Reial Club Deportiu Espanyol de Barcelona ([rəˈjal ˈklub dəpuɾˈtiw əspəˈɲɔl də βəɾsəˈlonə]; "Royal Spanish Sports Club of Barcelona"), commonly known as Espanyol, is a professional sports club based in Cornellà de Llobregat, Spain, that competes in La Liga, the top tier of the Spanish football league system.

Founded in 1900 in Barcelona, Espanyol currently play their home games at the RCDE Stadium, which holds up to 40,000 spectators. Domestically, Espanyol has won the Copa del Rey four times, most recently in 2006. In international competitions, the club reached the UEFA Cup final in 1988 and 2007. It has a long-standing rivalry with FC Barcelona.

Initially known as the Sociedad Española de Football on its foundation, the name was changed to Club Español de Fútbol in 1901. In 1906, the club folded due to financial reasons and most of the players joined the X Sporting Club, which came to win the Campionat de Catalunya three times in a row before disappearing in 1908 to merge with the Spanish Jiu-Jitsu Club to be effectively relaunched as the Club Deportivo Español, and in 1910, they adopted their present-day colours. Espanyol is one of several Spanish football clubs granted patronage by the Spanish crown and thus entitled to use Real in their names and the royal crown on their badge. This right was granted to Espanyol in 1912 by Alfonso XIII and the club subsequently became known as the Real Club Deportivo Español.

Following the abdication of the same king in 1931 and the declaration of the Second Spanish Republic, due to prohibition of royal symbols, the club adopted the more Catalan/republican friendly name, Club Esportiu Espanyol. After the Spanish Civil War, the name was reverted.

The club took the Catalan spelling for its name in February 1995. The word "Deportiu" in Reial Club Deportiu Espanyol de Barcelona is a Catalanised form of the original word "Deportivo" (Castilian), despite the correct word being "Esportiu" in the Catalan language. This choice was made in order to retain the initials "RCD" in the club's name.