'Linnet I' was an Allied unrealised plan for the use of airborne forces to capture and hold Tournai on the Escaut river in the western part of German-occupied Belgium (September 1944).

This strategically important town lay on the junction of General Sir Bernard Montgomery’s Allied 21^st Army Group and General Omar N. Bradley’s US 12^th Army Group, and the operation was based on the use of Lieutenant General Lewis H. Brereton’s Allied 1^st Airborne Army centred on Major General R. E. Urquhart’s British 1^st Airborne Division, Major General E. Hakewill-Smith’s British 52^nd Division, Major General Maxwell D. Taylor’s US 101^st Airborne Division, and Generał brygady Stanisław Sosabowski’s Polish 1^st Parachute Brigade. The plan was rendered superfluous by the rapid advance of Lieutenant General B. G. Horrocks’s XXX Corps of Lieutenant General Sir Miles Dempsey’s 2^nd Army, which took the corps past Tournai to Brussels by 3 September. The necessary airborne and air forces were also earmarked for 'Market'.