Ernestine Chassebœuf (née Troispoux) (1910–c.2005) was a (fictitious) French letter writer.
In 1999, she began to write letters denouncing, in a truculent and naive style, inefficiencies and inequities.
Alain Rémond and Jean Lebrun enabled her to gain a little celebrity.
Especially at the occasion of the debate about free lending of books in libraries, she wrote to all the writers who had signed the petition, demanding the withdrawal of their books from public libraries until an agreement had been found.
After this start, she continued to write to people in the economic, political, and literary world, or in the media; her common sense and frankness highlighted inconsistencies and mediocrity in French society.