original title
Refers to the title of a work (book, film, song, etc.) in its original language or as first published, before translation or adaptation.
この映画の原題はフランス語です。
The original title of this movie is in French.
論文の
The original title of this movie is 'Frozen'.
I changed the original title of the paper.
その小説は原題のまま出版された。
The novel was published under its original title.
タイトル is a casual, everyday loanword for a title, while 原題 is used specifically to mean the original-language title.
原題 is a work's title in its original language, while 邦題 is the Japanese title given to it for release.
Compound of 原 (original) and 題 (title).