Giedrius Titenis (born 21 July 1989) is a Lithuanian swimmer, who specialized in breaststroke events.
He is a two-time Olympian, a multiple-time Lithuanian record holder in the men's breaststroke, and a double swimming champion in the same discipline at the 2011 Summer Universiade in Shenzhen, China.
Titenis is also a member of Anykšciai Swimming Club, and is coached and trained by Žilvinas Ovsiukas.