Leberecht Maass (or Maaß) (24 November 1863 – 28 August 1914) was the rear admiral who commanded the German naval forces at the first Battle of Heligoland Bight. He lost his life when his flagship, the light cruiser SMS Köln, was sunk by British battlecruisers commanded by Vice Admiral David Beatty.
Maass was born in Korkenhagen, Province of Pomerania.
The (British) Royal Navy's Harwich Force of two light cruisers, Arethusa and Fearless, and 31 destroyers and commanded by Commodore Reginald Tyrwhitt, made a raid on German ships near the German naval base at Heligoland. Providing distant cover were the battlecruisers New Zealand and Invincible of Cruiser Force K under Rear-Admiral Moore.
In the early morning hours the Harwich Force encountered German torpedo boats on patrol west of Heligoland. The Germans quickly dispatched the light cruisers Frauenlob and Stettin to the scene, joined shortly afterwards by three more light cruisers out of Wilhelmshaven, including Rear Admiral Maass's flagship, Köln, as well as Ariadne and Strassburg. They were subsequently joined by yet another light cruiser, Mainz out of Emden. Tyrwhitt's Arethusa was severely damaged by Frauenlob, but the German cruiser also suffered heavy hits and retreated to Heligoland. Tyrwhitt soon received support from Commodore Goodenough's squadron of six modern Town class light cruisers: Southampton, Birmingham, Falmouth, Liverpool, Lowestoft and Nottingham. In the fog and smoke, Mainz found herself between Tyrwhitt's and Goodenough's forces and was sunk by them after a prolonged battle.
Called for assistance by Tyrwhitt, Admiral Beatty, whose First Battlecruiser Squadron of Lion, Queen Mary and Princess Royal had by then joined Moore's New Zealand and Invincible, arrived within little more than an hour at 12.40 p.m. and sank the hopelessly outgunned but desperately resisting light cruisers Köln and Ariadne.
The German navy named a World War II destroyer after Maass.