TEHRAN, Young Journalists Club (YJC) - Jens Stoltenberg will arrive in Skopje later Wednesday.
He will have meetings Thursday with the new left-led government, which came to power last year and has pledged to try and resolve the more than two-decade quarrel with Greece.
The two countries disagree over Macedonia's name.
Greece, which as a NATO member blocked its neighbor's NATO access in 2008, says it implies territorial claims on its own northern province of Macedonia. Macedonia denies that.
The dispute dates to 1991 when Macedonia peacefully gained independence from the former Yugoslavia. Greece recognizes the country as the Former Yugoslav Republic of Macedonia.