废弃建筑物是已放弃使用的建筑物，例如某些古迹、已关闭的学校和烂尾楼等。也有因为迁移而产生鬼镇，导致大量建筑物被废弃。

有些废弃建筑物可以通过复修或改变用途而重新使用。

In law, abandonment is the relinquishment, giving up or renunciation of an interest, claim, civil proceedings, appeal, privilege, possession, or right, especially with the intent of never again resuming or reasserting it. Such intentional action may take the form of a discontinuance or a waiver. This broad meaning has a number of applications in different branches of law. In common law jurisdictions, both common law abandonment and statutory abandonment of property may be recognized.