Who can initiate an optional referendum at the national level?

Macedonia's Constitution of 1991 (last amended in 2011)

Article 73. (Optional referendum)

The Assembly decides on issuing notice of a referendum concerning specific matters within its sphere of competence by a majority vote of the total number of Representatives. 

The decision of the majority of voters in a referendum is adopted on condition that more than half of the total number of voters voted.

The Assembly is obliged to issue notice of a referendum if one is proposed by at least 150,000 voters. The decision made in a referendum is binding.

Law on Referendum and Civil Initiative (Official Gazette of RM no. 24/1998)

Article 17. A proposal for announcing a legislative referendum may be submitted by the Government of the republic of Macedonia, every Member of the Parliament or at least 10,000 voters.

The proposal referred to in paragraph 1 of this article in the name of the voters shall be submitted by the authorized representative. The signatures of the voters shall be submitted together with the proposal.

The procedure for collecting signatures of the voters for announcing a legislative referendum shall be conducted in a way determined by law.