The ETA 2681 is a compact automatic watch calibre produced by ETA. It remains in production as of 2019.

Designed for ladies watches and other small applications, the 2681 is a slightly-larger variant of the ETA 2671. It measures just 8¾ lignes (19.4 mm) in diameter and is 4.8 mm tall. It includes hour, minute, and second hands and a date window.

Mechanical movement with automatical winding, ball-bearing rotor, bi-directional winding, power reserve 44 hours, date with rapid advance, hacking seconds device.