People
* Seppo Evwaraye (born 1982), Finnish National Football League offensive guard * Seppo Kääriäinen (born 1948), Finnish politician * Seppo Kolehmainen (1933–2009), Finnish film actor * Seppo Lehto (born 1962), Finnish political activist * Seppo Pääkkönen (born 1957), Finnish actor * Seppo Ruohonen (1946-2020), Finnish opera singer * Seppo Räty (born 1962), Finnish javelin thrower * Seppo Sairanen (born 1952), Finnish football manager and former goalkeeper *Seppo Seluska, Swedish neo-Nazi and subject of the historical photo '' A Woman Hitting a Neo-Nazi With Her Handbag'' * Seppo Simola (1936–2003), Finnish shotputter * Seppo Telenius (born 1954), Finnish writer * Seppo Harjanne (born 1948), Finnish WRC co-driver *Seppō Gison, the Japanese surname of Chinese Zen Master Xuefeng Yicun (822-908)Fictional or mythological characters
* Seppo Ilmarinen, the smith in the Kalevala of Finnish mythology * Seppo Taalasmaa, in the Finnish soap opera '' Salatut elämät''Other
* An Australian English variation on "septic" (from "septic tank", rhyming with "yank"), a slang term for "American" inSee also
* Sepo County, a county in North Korea *