|Brothers:||Marion Moseby, Dwight Howard (half-brother)|
|Grandparents:||Rose Moseby (grandmother)|
|Portrayed by:||Dana Michael Woods|
|First Appearance:||Moseby's Big Brother|
|Last Appearance:||Moseby's Big Brother|
Spencer Moseby is the older brother of Marion Moseby, and only appears in "Moseby's Big Brother". He is shorter than Marion and has a harsh rivalry with him. Spencer is a millionare, but goes bankrupt in "Moseby's Big Brother", though he regains his fortune the same episode.
- Spencer is lactose intolerant.