Kaj Ejstrup (20 February 1902 – 23 November 1956) was a Danish artist, illustrator and sculptor. Above all, he is remembered for the landscapes he painted in the north west of Zealand as a member of the artists' colony known as the Odsherred Painters. In 1932, he was one of the founding members of the Corner artists association. Much of his work can be seen at Odsherreds Museum of Art.