501st
501st Legion
501st Combat Support Group
501st Infantry Regiment (United States)
501st Combat Support Wing
501st Aviation Regiment (United States)
501st Military Intelligence Brigade (United States)
501st Heavy Panzer Battalion
501st Bombardment Squadron
501st Military Intelligence Battalion (United States)
501st Tactical Reconnaissance Squadron (JASDF)
2nd Infantry Division/ROK-US Combined Division Sustainment Brigade
501st Separate Naval Infantry Battalion
501 Squadron
521st Air Mobility Operations Wing
Star Wars: Battlefront II (2005 video game)
501st Brigade (ARBiH)
501e-503e Régiment de chars de combat
Star Wars Republic Commando (series)
101st SS Heavy Panzer Battalion
Clone trooper
List of aviation companies of the United States Army
101st Heavy Anti-Aircraft Regiment, Royal Artillery
85th Group
Forth Royal Garrison Artillery
1st Somersetshire Engineers
1st Middlesex Engineers