A police statement today says the man, who has Pakistani and British nationality, was arrested at airport passport control on the western resort island of Zakynthos.
It says the man was involved in the design of a building that crumbled following an earthquake in Pakistan in October 2005. Police said 84 people also were injured in the building's collapse.
The architect, who was arrested yesterday, was not named. Pakistan had asked Interpol to issue the international arrest warrant, though it was not immediately clear when.