Unnamed Romulan starships
The following is a list of unnamed Romulan starships.

By commander
 Jarok's scout ship
 Lovok's warbird
 Mirok's science ship
 Narissa's ship
 Oh's warbird
 Sela's warbird
 Tebok's warbird
 Tomalak's warbird
 Vreenak's shuttle

By class
 Unnamed D7-class starships
 Unnamed Romulan Birds-of-Prey (22nd century)
 Unnamed Romulan Birds-of-Prey (23rd century)
 Unnamed Romulan warbirds
 Unnamed D'deridex-class starships
 Unnamed Valdore-type starships

By unnamed class

Battle cruisers 
In 2364, a contingent of seven battle cruisers converged on a Federation border outpost. While the outpost called for reinforcements from the nearby  and , the encounter ended without incident. ()

Command ship  

This command ship covertly participated in the genetic puzzle that was being uncovered by Professor  in 2369.

According to the ship's captain, they had intercepted several communiques between the Yridians and Cardassia. He was later present, while under cloak, when Professor 's shuttlecraft was attacked. 

As the  picked up the mission where Galen left off, this ship shadowed the Enterprise, eventually arriving at Vilmor II, where the captain and a few of his crew surprised the Cardassian, Klingon, and Federation delegations that were present there, as they were attempting to discover the secret of the genetic codes that led them to the planet. 

The ship's captain later contacted Captain Jean-Luc Picard to inform his that his ships were leaving orbit for Romulan space. ()

Cruiser  
In 2365, Captain Donald Varley recorded a personal log aboard the  stating that they had "been spotted by a Romulan cruiser, but after playing hide and seek through several solar systems" he thought they had lost them. ()

Flagship 
This flagship lead the Romulan forces at the Battle of Cardassia, where it was destroyed by Dominion forces during a heavy assault that saw the Romulan lines collapse. ()

Patrol ships 

In 2346, several of these patrol ships, presumed to be Romulan Warbirds, attacked the Klingon colony on Khitomer after having received the defense access code from the outpost. These ships were able to lower the outpost's shields, and destroyed the outpost. 

Twenty years later, one of these ships was captured, and contained the logs that provided new information to the Klingon High Command on the Khitomer attack. These logs, according to Data, "clearly indicate a transmission from the outpost to the Romulans moments before the shields dropped." The High Command had learned of the treachery, but according to K'mpec, "only the council knew whose security code had been transmitted. Ja'rod, father of Duras." 

Since the House of Duras was powerful, according to K'mpec, "if the truth were known, it would shatter the council, almost certainly plunge us into civil war." Because "someone had to be blamed," the Council revealed that Mogh was responsible for the treason, and since Worf was in Starfleet, they "did not expect [him] to challenge the judgment." ()

Transport 
This transport delivered Ruwon and Karina to Deep Space 9 in 2371. Upon their arrival, they were routed to Docking Bay 12. ()

Vessel 
This vessel was defeated by the , using the Cochrane deceleration maneuver, near Tau Ceti in the late 2260s. ()

Unnamed Romulan starships
cs:Romulanský křižník
de:Romulanischer Schlachtkreuzer
nl:Romulan gevechtskruiser