Biga is a city in ÃÂanakkale Province in the Marmara region of Turkey. It is located on the Biga River, northeast from ÃÂanakkale city centre. It is the seat of Biga District. Its population is 57,125 (2021). The town lies at an elevation of . The center of COMU Faculty of Economics and Administrative Sciences is in Biga.
Within the area of Biga (at Karabiga) is the site of the ancient city of Pegaea (), also known as Pegae or Pegai (à÷óñï, "the Springs") until late Byzantine times (in Crusader sources it is also known as Spiga). Archaeologists have not yet established how far back the site has been occupied. In ancient times, Pegaea, located on the plain of Adrastea on the border between the Troad and Mysia, was sometimes included as part of one and sometimes the other. Since coming under Ottoman rule in 1364 it has been known as Biga. Under the Ottomans, it was the seat of a sanjak.
Among the tourist sites in the district are the Ilñcabashñ spa, Parion (Kemer), Priapos (Karabiga castle)
Biga is twinned with: