The 29-year-old has penned a two-and-a-half-year deal, and Hull hold the option of extending that contract by a further year.
The Tigers left it late on deadline day to push the deal through but have now boosted their attacking options as they look to preserve their Premier League status.
Hull manager Steve Bruce said: “I???m delighted to have completed the signing of Dame and I???m looking forward to seeing him in action for us.??
???He will undoubtedly strengthen our squad and add a significant goal threat.”
And the Hull website added: “N???Doye made his name at FC Copenhagen, where he scored 14 goals in his first season to help his side retain the Danish Superliga title.??
“The following season, the front man was instrumental in helping FC Copenhagen progress through to the UEFA Champions League Round of 16, scoring four goals in the process.??
“His eye for goal earned him a move to Lokomotic Moscow where he has netted 27 times in the Russian Premier League.”