Ridder may refer to:
Places DeRidder, Louisiana, city in US state of Louisiana Ridder, Kazakhstan, city in Kazakhstan (named for Philip Ridder)
Things Ridder (title), Dutch and Belgian title equivalent to knight Knight Ridder, newspaper chain Arbeidets Ridder, US newspaper (1880s), published in Minneapolis, Minnesota (Norwegian/Danish language; concerning news of interest to labor groups) Ridder Arena, an ice hockey arena in Saint Paul, Minnesota
People Alexandra Simons de Ridder (born 1963), German equestrian Atie Ridder-Visser (1914–2014), Dutch resistance fighter during World War II Bernard J. Ridder (1913–1983), American newspaper publisher Daniël de Ridder (born 1984), Dutch football player Desmond Ridder (born 1999), American football player Eric Ridder (1918–1996), US sailor and Olympic athlete Georgia B. Ridder (1914–2002), American thoroughbred racehorse owner Herman Ridder (1851–1915), American newspaper publisher and editor Kathleen Ridder (1922–2017), American activist and philanthropist Koen Ridder (born 1985), Dutch badminton player Louis De Ridder (1902–1981), Belgian winter sports athlete Luis de Ridder (1928–2004), Argentine alpine skier Marcello de Ridder (1922–1973), Argentine bobsled athlete Marjan Ridder (born 1953), Dutch badminton player Peter de Ridder (born 1946), Dutch sailor and businessman Peter Hollander Ridder (1608–1692), Governor of New Sweden Philip Ridder (1759–1838), Russian explorer who discovered valuable metal ores in Kazakhstan Robert Ridder (1919–2000), American ice hockey administrator, media mogul Steve De Ridder (born 1987), Belgian football player Victor F. Ridder (1886–1963), American newspaper publisher