Lieutenant Admiral Conrad Emil Lambert Helfrich (11 October 1886 – 20 September 1962) of the Royal Netherlands Navy was a leading Dutch naval figure of World War II.

His small force of submarines sank more Japanese ships in the first weeks of the war than the entire British and US navies together, an exploit which earned him the nickname "Ship-a-day Helfrich".

Helfrich's mission to defend Java at all costs clashed with Hart's desire to conserve as many naval units as possible.

On 2 September 1945, he signed the Japanese Instrument of Surrender aboard the battleship USS Missouri on behalf of the Kingdom of the Netherlands.

He was a fierce opponent of compromising with Sukarno and, supported by Chief of the General Staff Hendrik Johan Kruls, he objected to the Linggarjati Agreement of 15 December 1946, but without effect.