• A
• B
• C
• D
• E
• F
• G
• H
• I
• J
• K
• L
• M
• N
• O
• P
• Q
• R
• S
• T
• U
• V
• W
• X
• Y
• Z

Here is a list of all the sovereign countries with names beginning with the letter T.

• Tajikistan
• Tanzania
• Thailand
• Togo
• Tonga
• Trinidad and Tobago
• Tunisia
• Turkey
• Turkmenistan
• Tuvalu

Additional Consideration:
1) Taiwan: Claimed by the People's Republic of China; partially recognized, by twelve UN members.