Stadium, a building type (the usual modern name)

Arena rock, or stadium rock, a style of rock music

Stadium High School, located in Tacoma, Washington

Helsinki Polytechnic Stadia

Stadion, a building type (the same building type as a stadium, but in ancient Greece)

Stadia, stade, stadion, or stadium, an ancient unit of length.

Stadiametric rangefinding, a way of measuring distance using a telescope and triangulation

Stadia marks, marks on a telescopic sight's reticle that permit Stadiametric rangefinding or altitued measurements (height finding),   or Stadia rod, a related surveying tool used with telescopic based survey instruments.