The Romanian Navy is one of the smallest in Europe at the beginning of 1936 with 4 ships in their fleet.
This guide aims to bring some historical ships to the Romanian navy as well as some of my own made up designs to interpret what if scenarios for a Greater Romanian navy.

The Regia Marina starts with 4 ships with 1 under construction.

• Marasti: 2
  
• Regele Ferdinand: 2

• Delfinul Class: 1

Produced: 4
Owned: 2
The first class of destroyers for Romania is the Marasti class. This class consists of 4 ships with 2 in the Romanian fleet whilst the other 2 being kept by the Italians and later given to the Spanish.
The design in-game is how I would design it's original layout. The design below is the for the 1939 modernisation.
Design for the Class:

• Light Battery I - (120mm)
  
• Anti-Air III - (37mm)
  
• Fire Control - Your Choice
  
• Radar/Sonar - Your Choice
  
• Torpedo I - (450mm)
  
• Engine I - (45,000hp)
  
• Depth Charge
  
• Anti-Air I - (50 cal) - Later modernised to Anti-Air II (20mm) in 1943-44

Ships of Class:

• Marasti
  
• Marasesti
  
• Vifor
  
• Viscol

Produced: 2
Owned: 2
The Regele Ferdinand class is the last class of destroyers for Romania. After this Romania historically focused on Submarines. It's design in-game isn't how I would of put it as.
Design for the Class:

• Light Battery II - (120mm)
  
• Anti-Air I - (50 cal) - Later modernised to Anti-Air II (20mm) in 1943
  
• Fire Control - Your Choice
  
• Radar/Sonar - Your Choice
  
• Torpedo III - (533mm)
  
• Engine II - (52,000hp)
  
• Mines
  
• Depth Charge

Ships of Class:

• Regele Ferdinand
  
• Regina Maria

Produced: 1
Planned: 1 - under construction
The Delfinul Class is the first submarine class built by Romania consisting of a single ship. In-game the design is almost correct however the ship never had mines.

Ships of Class:

• Delfinul

Produced: 1
Planned: 1
The Requinul Class is the next submarine class built by Romania consisting of a single ship.

• Torpedo I - (450mm) - (533mm)
  
• Engine II - (2,000hp)
  
• nothing
  
• Snorkel
  
• nothing

Ships of Class:

• Requinul

Produced: 1
Planned: 1
The Marsuinul Class is the last WW2 submarine produced by Romania.
Design for the Class:

• Torpedo I - (450mm) - (533mm)
  
• Engine II - (2,000hp)
  
• nothing
  
• Snorkel
  
• Mines

Ships of Class:

• Marsuinul

This list consists of made up classes by me for a what-if scenario where Romania started to build up a larger fleet.

The Constanta Class of battleships is my what-if scenario battleship class of Greater Romania. The class would consist of 1-3 ships based primarily from the Italian Littorio Class.
Design for the Class:

• Heavy Battery II (305mm)
  
• Anti-Air III (37mm)
  
• Fire Control - Your Choice
  
• Radar/Sonar - Your Choice
  
• Engine II (90,000hp)
  
• Secondaries II (120mm)
  
• Battleship Armour I (200mm)
  
• Heavy Battery II (305mm)
  
• Heavy Battery II (305mm)
  
• Anti-Air III (37mm)
  
• Anti-Air II (20mm)
  
• Floatplane

Ships of Class:

• Constanta
  
• Tirgu Mures
  
• Cluj Napoca

The Elisabeta Class of Heavy Cruiser is my what-if scenario Heavy Cruiser class of Greater Romania. The class would consist of 1-4 ships based primarily from the Italian WW2 Heavy Cruiser Classes however with mines also as Romania had put mines on almost all their classes of ship.
Design for the Class:

• Medium Battery III (203mm)
  
• Anti-Air IV (40mm)
  
• Fire Control - Your Choice
  
• Radar/Sonar - Your Choice
  
• Engine III (80,000hp)
  
• Secondaries II (120mm)
  
• Cruiser Armour II (100mm)
  
• Anti-Air IV (40mm)
  
• Torpedo III (533mm)
  
• Medium Battery II (190mm)
  
• Mines
  
• Floatplane

Ships of Class:

• Elisabeta
  
• Timosoara
  
• Arad
  
• Oradea

The Baia Mare Class of Light Cruiser is my what-if scenario Light Cruiser class of Greater Romania. The class would consist of 1-4 ships based primarily from the Italian WW2 Light Cruiser Classes however with mines also as Romania had put mines on almost all their classes of ship.
Design for the Class:

• Light Cruiser Battery I (145mm)
  
• Anti-Air III (37mm)
  
• Fire Control - Your Choice
  
• Radar/Sonar - Your Choice
  
• Engine II (70,000hp)
  
• none
  
• none
  
• Anti-Air II (20mm)
  
• Torpedo III (533mm)
  
• Light Battery II (120mm)
  
• Light Battery II (120mm)
  
• Mines

Ships of Class:

• Baia Mare
  
• Sighetu Marmatiei
  
• Bistrita
  
• Reghin

The Vice-Amiral Rosca Class of Destroyers is my what-if scenario destroyer class of Greater Romania. The class would consist of 7-9 ships based primarily from the later Italian WW2 destroyer Classes however with mines also as Romania had put mines on almost all their classes of ship.
Design for the Class:

• Light Battery II (120mm)
  
• Anti-Air III (37mm)
  
• Fire Control - Your Choice
  
• Radar/Sonar - Your Choice
  
• Torpedo III (533mm)
  
• Engine II (52,000hp)
  
• Anti-Air II (20mm)
  
• Depth Charge
  
• Mines

Ships of Class:

• Vice-Amiral Rosca
  
• Amiral Barbuneanu
  
• Contraamiral Sebastian
  
• Contraamiral Macellariu
  
• Zborul
  
• Pescarusul
  
• Lastunul
  
• Vifor (named after destroyer of the Marasati Class)
  
• Viscul (named after destroyer of the Marasati Class)

The Baracuda Class of Submarines is my what-if scenario Submarine class of Greater Romania. The class would consist of 5-10 ships based primarily from the German WW2 Submarines Classes however with mines also as Romania had put mines on almost all their classes of ship.
Design for the Class:

• Torpedo II (533mm)
  
• Engine III (3,000hp)
  
• none
  
• Snorkel
  
• Mines

Ships of Class:

• Baracuda
  
• Narval
  
• Nautilus
  
• Somonul
  
• Peste-Spada
  
• Cambula
  
• Macrou
  
• Leu de Mare
  
• Ancheta
  
• Ansoa

If I have missed any ship classes out please do comment.

Other Guides:
Allies:
France
United States

Axis:
Germany
Italy

Commitern:
Soviet Union