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Bartholomeus Jan "Bart" Bok (April 28, 1906 – August 5, 1983) was a Dutch-born American astronomer, teacher, and lecturer. He is best known for his work on the structure and evolution of the Milky Way galaxy, and for the discovery of Bok globules, which are small, densely dark clouds of interstellar gas and dust that can be seen silhouetted against brighter backgrounds. Bok suggested that these globules may be in the process of contracting, before forming into stars.

Bok married fellow astronomer Dr. Priscilla Fairfield in 1929, and for the remainder of their lives, the two collaborated so closely on their astronomical work that the Royal Astronomical Society said "from that point on it is difficult and pointless to separate his achievements from hers". The Boks displayed such great mutual enthusiasm for explaining astronomy to the public that The Boston Globe described them in 1936 as "salesmen of the Milky Way". They worked together on research and co-authored academic papers, and their general interest book The Milky Way went through five editions and was "widely acclaimed as one of the most successful astronomical books ever published".