Kokoro Tanaka is a Japanese voice actor affiliated with the talent management agency B-Box. He is originally from Osaka Prefecture and was born on May 21, 1974. He was previously known by a different name, Kazutada Tanaka, which he used early in his career when he was affiliated with Arts Vision. He changed his name upon moving to his current agency.

Tanaka is best known for his long-standing involvement in the Hetalia anime franchise. He voices the character of Poland in the series, a role he has played since early installments such as Hetalia Axis Powers and Hetalia World Series. In addition to his work as Poland, he also provides the voice for the character of Latvia in later Hetalia projects. This includes the 2015 series Hetalia The World Twinkle and the 2021 series Hetalia World Stars, for which he was confirmed as a returning cast member. This dual role within the same franchise represents a notable aspect of his career.

Beyond the Hetalia franchise, his profile includes other voice roles, demonstrating his range as a performer. These credits include a character named Higashino Kazuhiko and a leading role in a production titled Hadaka Shitsuji. His career is also marked by recognition from a radio program segment titled Koe ni Narō, where he achieved a notable status.