Category:International borders of the European Union

• Territorial disputes of the European Union‎ (4 C)

B

• Bosnia and Herzegovina-Croatia border‎ (3 C, 40 F)
• Bulgaria-North Macedonia border‎ (8 C, 3 F)

C

• Croatia-Montenegro border‎ (4 F)

S

• Bulgaria-Serbia border‎ (1 C, 2 F)
• Croatia-Serbia border‎ (2 C, 2 F)
• Romania-Serbia border‎ (3 C, 1 F)

T

• Bulgaria-Turkey border‎ (5 C, 6 F)

U

• Romania-Ukraine border‎ (5 C, 13 F)
• France-United Kingdom border‎ (2 C, 3 F)
• Republic of Ireland-United Kingdom border‎ (5 C, 42 F)