• Naval battles of World War I by country (15 C)

A

• Battles of World War I involving Australia (4 C, 116 P)
• Battles of World War I involving Austria-Hungary (3 C, 114 P)

B

• Battles of World War I involving Indian Princely States (11 P)
• Battles of World War I involving Belgium (3 C, 29 P)
• Battles of World War I involving Brazil (1 C)
• Battles of World War I involving Bulgaria (32 P)

C

• Battles of World War I involving Canada (3 C, 37 P)

F

• Battles of World War I involving Finland (1 C)
• Battles of World War I involving France (6 C, 187 P)

G

• Battles of World War I involving Germany (9 C, 448 P)
• Battles of World War I involving Greece (9 P)

I

• Battles of World War I involving British India (2 C, 78 P)
• Battles of World War I involving Italy (2 C, 36 P)

J

• Battles of World War I involving Japan (1 C)

M

• Battles of World War I involving Montenegro (3 P)

N

• Battles of World War I involving New Zealand (4 C, 76 P)
• Battles of World War I involving Newfoundland (1 C, 6 P)

O

• Battles of World War I involving the Ottoman Empire (2 C, 154 P)

P

• Battles of World War I involving Poland (16 P)
• Battles of World War I involving Portugal (3 C, 13 P)

R

• Battles of World War I involving Rhodesia (1 C, 1 P)
• Battles of World War I involving Romania (55 P)
• Battles of World War I involving Russia (3 C, 97 P)

S

• Battles of World War I involving Serbia (19 P)
• Battles of World War I involving South Africa (3 C, 28 P)

U

• Battles of World War I involving the United Kingdom (6 C, 292 P)
• Battles of World War I involving the United States (3 C, 32 P)