Helmi Arneberg-Pentti (13 August 1889 - 22 January 1981)[1] was the chairman of Lotta Svärd, the Finnish auxiliary organisation for women, from 1921 to 1922 and 1925 to 1929.

Helmi Arneberg was born on 13 August 1889 in Kristiania (now Oslo), Norway to Lydia Matilda Lagus and Jonas Lund-Arneberg, a lawyer.

In 1920, the commander-in-chief of the Protectorate[clarification needed] invited Arneberg-Pentti to chair a committee tasked with devising the statutes of the organisation, which remained the basis for the Lotta's activities until the war years.

[2] During the 1920s, the organisation was still in a formative stage, and there was friction between different interest groups about its aims and objectives, which led to internal problems.

When Arneberg-Pentti had to resign the leadership of Lotta Svärd in 1929 for family reasons, her departure was felt as a heavy loss for the organisation.

Her role was later overshadowed by that of her successor as chair, Fanni Luukkonen who built the Lottas into a much larger national organisation, particularly during the Second World War period.

[2] The terms of the peace agreement with the Soviet Union at the end of the 1941-1944 Continuation War included the abolition of the Lotta Svärd organisation.