Arabic (????) : Wafaa El-Hakim / وفاء الحكيم  (speaking) & ​Najlaa Mohammad 'Ali / نجلاء محمد علي (singing)
Brazilian : Vera Lúcia Dias
Cantonese (1995) : ?
Catalan (2005) : Isabel Valls
Czech (2004) : Stanislava Jachnická
Danish : Susanne Bruun-Koppel
Dutch : Trudy Libosan
English : Eva Gabor (speaking) & Robie Lester (singing)
Finnish (1997) : Carita Mäkelä
French : Béatrice Delfe
German : Gisela Fritsch
Greek : Ánna Yeralí / Άννα Γεραλή
Hebrew (1990) : Chani Nachmias / חני נחמיאס
Hungarian (2001) : Kiss Mari
Italian : Melina Martello
Japanese 1981 : Shindō Noriko / 新道乃里子
Japanese 2000 : Obara Noriko / 小原乃梨子​
Korean (2002) : Lee Sun / 이선 (speaking) & Bae Hae-Sun / 배해선 (singing)
Latin Spanish : Diana Santos
Mandarin (Taiwan) (????) : Liú Xiǎo-Yún / 劉小芸 [wikipedia]
Norwegian (19??) : Unn Vibeke Hol
Polish (????) : Ewa Złotowska (speaking) & Karina Szafrańska (singing)
Russian (2005) : Anna Kamenkova-Pavlova / Анна Каменкова-Павлова
Swedish : Margareta Sjödin​
Thai (????) : Sukanda Bunyathanmik / สุกานดา บุณยธรรมิก [credited as : Sukanda Sirithanaphirom / สุกานดา ศิริธนาภิรมย์]
Turkish (20??) : ?
Ukrainian (2016) : Kateryna Serheeva-Konovalova / Катерина Сергеева-Коновалова (?)

ANECDOTES
- As her singing line is really short, Bianca's singing voice is almost never credited. And it's not excluded some of the speaking voices did the singing as well.
- Sukanda Bunyathanmik, the Thai voice of Bianca, is also the soloist singer in the movie.