The term Free Polish can refer to the following:

• Polish government-in-exile - The remnants of the Polish government, based in the United Kingdom
  United Kingdom
  The United Kingdom of Great Britain and Northern IrelandIn the United Kingdom and Dependencies, other languages have been officially recognised as legitimate autochthonous languages under the European Charter for Regional or Minority Languages...
  
  , following the Invasion of Poland
  Invasion of Poland (1939)
  The Invasion of Poland, also known as the September Campaign or 1939 Defensive War in Poland and the Poland Campaign in Germany, was an invasion of Poland by Germany, the Soviet Union, and a small Slovak contingent that marked the start of World War II in Europe...
  
   during World War II
  World War II
  World War II, or the Second World War , was a global conflict lasting from 1939 to 1945, involving most of the world's nations—including all of the great powers—eventually forming two opposing military alliances: the Allies and the Axis...
  
  
• Polish Armed Forces in the West
  Polish Armed Forces in the West
  Polish Armed Forces in the West refers to the Polish military formations formed to fight alongside the Western Allies against Nazi Germany and its allies...
  
   - The military forces of the Polish government-in-exile serving with the Western Allies
  Western Allies
  The Western Allies were a political and geographic grouping among the Allied Powers of the Second World War. It generally includes the United Kingdom and British Commonwealth, the United States, France and various other European and Latin American countries, but excludes China, the Soviet Union,...
  
   in many of the major battles of World War II.

However, the expression "Free Polish" (inspired by the term Free French) is technically misleading and unnecessary since, unlike France, Poland never surrenderred

Surrender (military)

Surrender is when soldiers, nations or other combatants stop fighting and eventually become prisoners of war, either as individuals or when ordered to by their officers. A white flag is a common symbol of surrender, as is the gesture of raising one's hands empty and open above one's head.When the...

 to the Third Reich

Nazi Germany

Nazi Germany , also known as the Third Reich , but officially called German Reich from 1933 to 1943 and Greater German Reich from 26 June 1943 onward, is the name commonly used to refer to the state of Germany from 1933 to 1945, when it was a totalitarian dictatorship ruled by...

. Poland's armed forces, under an exilé but fully legitimate government, continued their fight from bases in the United Kingdom and there was no official collaborator regime in their homeland to differentiate from in political terms.