The 2008 Istanbul Cup was a women's tennis tournament played on outdoor clay courts. It was the 4th edition of the Istanbul Cup, and was part of the Tier III Series of the 2008 WTA Tour. It took place in Istanbul, Turkey, from 19 May through 24 May 2008. Second-seeded Agnieszka Radwańska won the singles title and earned $30,500 first-prize money.
See main article: 2008 İstanbul Cup – Singles. 
Agnieszka Radwańska defeated 
Elena Dementieva, 6–3, 6–2
See main article: 2008 İstanbul Cup – Doubles. 
Jill Craybas / 
Olga Govortsova defeated 
Marina Erakovic / 
Polona Hercog, 6–1, 6–2