The trip by Kim Yong-Nam will be the diplomatic high point of the rapprochement between the two Koreas triggered by the Pyeongchang Games in the South, which have their opening ceremony on Friday.
Tensions spiralled last year as the North carried out multiple weapons tests, including intercontinental ballistic missiles it says are capable of reaching the mainland United States, and its most powerful nuclear blast to date.
For months, it ignored Seoul's entreaties to take part in a "peace Olympics", until leader Kim Jong-Un indicated his willingness to do so in his New Year speech.
The North's Olympic participation would include a visit by a high-level delegation, they agreed.
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It will be led by Kim Yong-Nam, who is leader of the Presidium of the Supreme People's Assembly, the North's ruling-party-controlled parliament, Seoul's unification ministry said in a statement.
Kim -- who is not a close blood relative of leader Kim Jong-Un -- will arrive on Friday for a three-day visit, accompanied by three other officials and 18 support staff, the ministry said it had been told by Pyongyang.
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