TCG Birinci İnönü
TCG Birinci İnönü ("First Inonu") sometimes written as I. İnönü, is the name of several Turkish submarines, named in commemoration of the Turkish victory at the First Battle of İnönü in January 1921

It can refer to:

 , built in NL Wilton-Fijenoord launched Jan 29 1927, comm. June 9, 1928 decommissioned 1948 
 , ex  USS Brill (S-330), an un-modified Balao-class submarine acquired 1948, decommissioned 1972
 ,  ex USS Threadfin (S-410), a Balao-class GUPPY IIA submarine acquired 1972, decommissioned 1998

 ,  a Gür-class submarine built in 2007

See also
 

Turkish Navy ship names