The hit duo will write the show, which will be in a miniseries format, reported Variety.
Gatiss and Moffat will start working on the series as soon as they finish their current solo projects.
Sue Vertue's Hartswood Films will produce the show alongside other international partners that are expected to board the project.
"Dracula" will be the first collaboration between Moffat and Gatiss since the last "Sherlock" episode that aired in January.