Yuka Kosaka (小阪由佳, こさか ゆか born June 27, 1985) is a Japanese gravure idol and actress.
She is also known as her nickname "Yuka-chin", and has starred in a number of TV dramas and films.
Yuka made her debut in 2004 after winning the Grand Prix award in Miss Magazine 2004.
After her first DVD peach went on sale on March 25, 2004, her DVDs have constantly produced.
In the fall of 2004, Yuka’s popularity rose when she became the campaign girl for the Japanese convenience store, Circle K Sunkus.