Jacques Bu[h]ot (before 1623 – January 1678) was a French mathematician, engineer, physicist, and astronomer.
He worked on the constructions of forts and compiled a mathematics textbook apart from being one of the first seven mathematician members of the Royal Academy of Sciences.
He made observations on the solar eclipse of 8 April 1652 along with Jacques-Alexandre le Tenneur and Adrien Auzout.
He devised an azimuthal square that would help identify the longitude without the need for measurements at noon which was later constructed along with Claude Antoine Couplet who also married Buot's step daughter Marie Baillot.
He is thought to have died around January 1678 since Philippe de la Hire was appointed as his substitute at the Academy.