Jacob Ellsworth Daubert (April 7, 1884 – October 9, 1924) was an American first baseman in Major League Baseball who played for the Brooklyn Superbas and Cincinnati Reds. His career lasted from 1910 until his death in 1924.

Daubert was recognized throughout his career for his performances on the field. He won the 1913 and 1914 National League batting titles, as well as the 1913 Chalmers Award. Between 1911 and 1919, The Baseball Magazine named him to their All-American team seven times. Baseball historian William C. Kashatus observed that Daubert was "a steady .300 hitter for 10 years of the Deadball Era", who "never fielded below the .989 mark" during the same period.

Daubert was born in Shamokin, Pennsylvania, to Jacob and Sarah Daubert. The lack of child labor laws enabled Daubert to go to work early in his life. In 1895, at the age of eleven, the young Daubert joined his father and two brothers at work in the local coal mines.

In 1906, Daubert left his job at the mines and signed a contract with a baseball team in Lykens, Pennsylvania. He was originally a pitcher on the team before he converted to first base. At the end of the 1906 season, Daubert left Pennsylvania and traveled west to Ohio. There, he spent the 1907 season on teams in Kane, Pennsylvania and Marion, Ohio.

In 1908, Daubert was signed by the Cleveland Indians. However, Daubert never played for Cleveland as they released him shortly thereafter. He left Cleveland and signed with the Nashville club of the Southern Association. He spent the remainder of the season with Nashville.

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