The state of emergency was originally imposed in the immediate aftermath of the massacre of 38 people last June, which included 30 British tourists.
It was lifted in October but reinstated a month later in November following the attack on presidential guards in the capital Tunis.
The president’s office said the decision was made in consultation with parliamentary and government officials.
The state of emergency means Tunisian authorities can forbid strikes and public gatherings, and control the press.
Elsewhere the director general of security Amor Messaoud announced on Sunday that 72 additional police posts were being added in tourist zones, as well as 1,500 more police officers.
Tunisia extends state of emergency
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