Osovcy (official transliteration: Asaŭcy) is an air base of the Air Force and Air Defence Forces of the Republic of Belarus located in Byaroza, Brest Region, Belarus. Bereza (Osovcy) is 7 km NW of Byaroza. Alternate given coordinates are 52° 33.4' N 24° 52.8' E.
The airfield is one of the oldest in Soviet/Russian aviation history. Mentions of it date back to 1915, when a separate combat detachment was based at the airfield, consisting of two aircraft "Ilya Muromets" from the 4th aviation company based at the airfield Lida. The detachment operated jointly with the Imperial 3rd Army from February 1915 and, in addition to Bereza, was also based at airfields in Brest-Litovsk and Slutsk.
By September 10, 1915, Bereza-Kartuzskaya (the name of the city was Bereza (Birch) until 1940) was occupied by the Germans. The combat detachment of Ilya Muromets aircraft flew to Slutsk, from where it continued to bomb enemy positions in Bereza Kartuzskaya, Skobelevsky camp, Baranovichi and nearby railway stations. A German aviation detachment was relocated to Bereza, equipped with Albatros D.I aircraft. 
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