Eelco Alta (23 June 1723, in Makkum, Súdwest-Fryslân – 17 August 1798, in Bozum) was a Frisian clergyman, theologian, and veterinarian.
He was politically active in the last years of the Dutch Republic, siding (although not explicitly) with the forces of republican "Patriotism", partly for religious reasons.
During the royalist backlash of the late 1780s, this caused him some problems: some of his sons were actively persecuted, while he was forced to leave Boazum between 1790 and the Batavian Revolution of 1795.
Thereafter, he shortly served as a member of the newly installed parliament of the Batavian Republic, but afterward admitted to prefer spending his time with his congregation.
Initially anonymously, Alta authored a treatise in 1774, Philosophical Considerations concerning the Conjunction of the Planets Jupiter, Mars, Venus, Mercury and the Moon.