Hadai G. Clara, born Geier (Lupeni, 20 August 1938) is a Romanian-Hungarian textile artist, graphic designer and book illustrator. Hadai Jenő’s wife.
She graduated from Ion Andreescu Academy of Fine Arts - Textile Department (1964). She was a costume designer for Buftea Film Studio in 1965, graphic artist for Jóbarát magazine starting with 1967. In 1974 she joined the editorial Vatra Studenţească.
Her graphics illustrations appeared in Pionierul, Jóbarát, Cutezătorii and Előre - calendars. She made illustrations and covers for writes such as: Toth Maria, Balogh Irma, Bokor Katalin, Ambrus Lajos, Constanţa Buzea, Szabó Magda (Mondják meg Zsófikának – the Romanian edition of the novel), Matthew Imre - A nap kalapja (1980), Francis Szemlér - Lim Lom (1986), Mora Ferenc - Kincskereső kisködmön (1987), Mora Ferenc - Rab ember fiai és más történetek (1992), Dorian Green - High horoscope book (1993), Lakatos Mihály - Etimo apó csodálatos meséi (2002, 2012).
