Ishiguro Aya (石黒彩) is a Japanese singer, writer, TV personality and fashion designer. She is a former idol under Hello! Project as a founding member of Morning Musume. She was also a member of the Morning Musume sub-group Tanpopo. She graduated from Hello! Project in January 2000. Later, in 2018, she was part of the reunion group Morning Musume 20th.