Diandra Mulyani Devereaux was a Federation Starfleet officer on active duty in the 23rd and 24th centuries.

Diandra was born in Yogyakarta Baru in early 2264. Both of her parents were professors at the university there. She was the youngest of four children.

During an attempted coup d'état, her parents and two oldest siblings were killed. Starfleet ships, including the USS Avenger, assisted the colony and evacuated the survivors, including Diandra and her brother Iwan (born 2262). (Star Trek: Shadowstar Station/Star Trek: Avenger: Time, See What's Become of Me)

About 2270, Diandra and Iwan were adopted by Barbara Devereaux, a former science officer of the Avenger who had transferred to Starbase 7.

At Starfleet Academy in the mid-2280s, Diandra was one of many midshipmen who were pressed into service during the Whalesong crisis. (Star Trek IV: The Voyage Home)

By 2310, Diandra had become CAG on USS Malverne. (Star Trek: Malverne: At Gamma Hydrae)