Rutricha Phapakithi (รัตท์ริชา ประภากิติ; born September 23, 1999), formerly Apichaya Saejung (อภิชญา แซ่จัง), nicknamed Ciize (ไซซี), is a Thai actress, singer and model under GMMTV and Riser Music. She is the main dancer of the girl group SIZZY. In 2022, she graduated with a bachelor's degree from the Chinese International College at Bangkok University, majoring in Business Chinese.

She made her acting debut in 2015 with a supporting role in the series "Wonder Teacher" (อัศจรรย์คุณครูเทวดา).

Her nickname, Ciize, comes from the Chinese "Xi Shi" (张西施 ), one of the legendary Four Beauties. Her father chose it to influence her to grow up as beautiful as the Four Beauties.

Aside her acting and singing career, Ciize co-owns the clothing brand 'Madly Dizzy', along with the other SIZZY members.