The Chilean submarine Tegualda was an H-class submarine of the Chilean Navy. The vessel was originally ordered by the United Kingdom's Royal Navy as HMS H16, but was handed over to Chile in 1917 as H2.
Tegualda was a single-hulled submarine, with a pressure hull divided into five watertight compartments. The submarine had a length of overall, a beam of and a draft of . She displaced on the surface and submerged. The H-class submarines had a crew of 22 officers and enlisted men.
The submarine had two propellers, each of which was driven by a diesel engine as well as a electric motors. This arrangement gave Tegualda a maximum speed of while surfaced and submerged. She had a range of at while on the surface and at while submerged. The boat had a capacity of of fuel oil. The H-class submarines were equipped with four torpedo tubes in the bow and carried eight torpedoes.
H16 was a H-class submarine built by Fore River Yard of Quincy, Massachusetts. She was launched on 26 July 1915. Because the United States was neutral (having not yet entered World War I), H16 along with sister ships , , , , , , , , and were all interned by the United States government. As a result, H16 was never commissioned into the Royal Navy. Instead, she and H13, H17, H18, H19, and H20 were transferred to the Chilean Navy as partial recompensation for the appropriation of two 28,000-ton dreadnoughts ( and ). Originally named H2 when turned over to Chile in 1917, she was renamed Tegualda in 1924. She served with the Chilean Navy until she was stricken in 1945.