Subcommander D'ridthau was a Romulan military officer during the Romulan-Haakonan War.

In 2156, D'ridthau served aboard the ChR Terrh'Dhael when it led the attack on Haakona Prime. D'ridthau was very concerned about the attack before it was launched, leading Centurion Belak to question his motivations. (ENT novel: Beneath the Raptor's Wing)

The flagship D'ridthau is likely to have been named for this individual.