Ilonka Haruka Tatianna Orth (born in Chicago, USA, November 16, 1982) is a Hungarian-American actress, director, and astrologer who lives in Kichijōji, Tokyo, Japan. She is a graduate of International Christian University in Mitaka, Tokyo, Japan and currently works for the production agency R&A Promotion.

Fluent in Japanese, Orth is most known for her appearances on the Akashiya Sanma hosted variety program Koi no Karasawagi, her portrayal of the villain Marlene in the cult film Siberian Express 5, and her frequent participation in the program Waratte Iitomo!. She also gained notability for being the first non-Japanese to be featured in the long-running Saturday Wide Theatre, and was featured in newspapers across the country.

Orth performs in a variety of vaudeville-style television shows, often introducing Hungarian food, customs and culture.

Orth is involved in Japanese theatre industry^{[need quotation to verify]}, translating foreign plays into Japanese and vice versa, writing scripts, working in production, and participating as an actor in plays as well, when the script calls for a gaikokujin. She also writes theatre reviews for Gekijo Magazine, and directs for Green Theatre in Ikebukuro.

She also is currently a reporter on the NHK program Journeys in Japan.