家神，**又称家堂佛，日本又称屋内神，是指东亚民间信仰中在家中供奉的神祇，是保护家宅的神祇，常常不限于一位。故有家堂五神、家宅六神等说法。最早的家神信仰，源于周礼记载的小五祀——门神、户神、行神或井神、灶神、中霤神，天子需要定时祭祀，而士人需要选择其中的一到二位祭祀，周礼为儒教经典，是中国文化的源头之一，中国历代礼俗都可以从周礼找到由来。但周礼的家神一般并无具体指称。现代**的「家堂五神」为观音菩萨、天上圣母、关圣帝君（或玄天上帝）、灶君、土地神。而「家宅六神」在中国为灶王（或锺馗）、地主神、门神（户尉）、井泉童子、三姑夫人（或东厕司）。

A household deity is a deity or spirit that protects the home, looking after the entire household or certain key members. It has been a common belief in pagan religions as well as in folklore across many parts of the world.

Household deities fit into two types; firstly, a specific deity- typically a goddess- often referred to as a hearth goddess or domestic goddess who is associated with the home and hearth, with examples including the Greek Hestia and Norse Frigg.