Feyenoord Rotterdam (Dutch pronunciation: [ˈfɛiəˌnoːrt]) is a Dutch professional association football club in Rotterdam, which plays in the Eredivisie, the top tier in Dutch football. Founded as Wilhelmina in 1908, the club changed to various names before settling on being called after its neighbourhood in 1912 as SC Feijenoord, updated in 1974 to SC Feyenoord, and then to Feyenoord in 1978, when it split from the amateur club under its wing, SC Feyenoord. Since 1937, Feyenoord's home ground has been the Stadion Feijenoord, nicknamed De Kuip ('the tub'), the second largest stadium in The Netherlands.

Feyenoord is one of the most successful clubs in Dutch football, winning 15 Dutch football championships, 13 KNVB Cups, and 4 Johan Cruyff Shields. Internationally, it has won one European Cup, two UEFA Cups, and one Intercontinental Cup. The club has played continuously in the top tier of the Dutch football system since gaining promotion to Eerste Klasse (the Eredivisie's forerunner competition) in 1921, more times than any other club in the country, including the likes of Ajax and PSV Eindhoven.

Feyenoord is known as a people's club with a huge national and international support. Its most successful period was the 1960s and 1970s, when Coen Moulijn and Ove Kindvall led the club to six league titles, two European trophies, and an Intercontinental Cup, thereby becoming the first Dutch club in history to win both the European Cup and the Intercontinental Cup. In the 21st century, Feyenoord ended an 18-year league title drought in 2017 and won the 2002 UEFA Cup against Borussia Dortmund in its home stadium, which makes them the first and still the last team from the Netherlands to win a European trophy this century.

Feyenoord has a longstanding rivalry with their arch rival Ajax, a clash between two teams from the two biggest cities in the Netherlands, called De Klassieker ("The Classic"). The club's anthem is "Hand in Hand". The home shirt colours are red and white split down the middle with both the shorts and socks being black.

As of 2017, Feyenoord is a multi-sports club, including Sportclub Feyenoord (amateur football team), Feyenoord Basketball, Feyenoord Futsal and Feyenoord Handball.