The signing, by Wellington Mayor Justin Lester and Seoul Metropolitan Council Chairman Yang Jun Yook, will take place at The Wellington Club at 12 noon.
A 16-strong delegation from Seoul, led by Chairman Yang and including several environment and transportation officials, arrives in Wellington today.
The group will visit Weta Studios tomorrow morning before the lunchtime signing function.
The relationship between Wellington and Seoul has been strengthened considerably in recent years. Several Wellington business delegations led by the Mayor have visited Seoul, including one last November.
Seoul has a particularly buoyant gaming industry, which has attracted the interest of some Wellington businesses.
Mayor Lester and Chairman Yang are expected to discuss issues such as transport, safe cities, liveability and resilience.
It is hoped that the Memorandum of Understanding will be a prelude to Seoul and Wellington eventually establishing a Sister City relationship.