The 123rd Fighter Escadrille of the Polish Air Force (Polish: 123. eskadra myśliwska) was one of the fighter units of the Polish Army in 1939.
In September 1939 the 123rd Fighter Escadrille was part of the Pursuit Brigade.
On 1 September 1939 the escadrille had 10 PZL P.7a airplanes.
The air crew consisted of: commanding officer kpt. pil. Mieczysław Leonard Olszewski his deputy ppor. pil. Erwin Kawnik and 11 other pilots: