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Dagmar Lahlum

1923 – 1999

World War II Norwegian resistance member

Double agent
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About Dagmar Lahlum

Lived 1923 – 1999 (aged 76). Dagmar Lahlum was a Norwegian double agent.

Dagmar Mohne Hansen Lahlum (10 March 1923, Norway – 28 December 1999) was a member of the Norwegian resistance in Oslo during World War II and was later recruited (unofficially) to work for MI5.

Early life The daughter of a shoemaker, Lahlum was born in Eidsvoll, but moved to Oslo when she was 17, shortly before the start of the war. Initially she worked as a receptionist in a city centre hotel and later took modeling classes.

World War II

In April 1943, when British double agent Eddie Chapman was drinking with German officers in The Ritz bar at Skillebekk, which was also popular with members of the Norwegian national socialist party, his eye fell on the attractive Dagmar, who – complete with a décolletage and high heels – was smoking Craven A's with an ivory mouthpiece.

When he first chatted her up, he thought that she was either a prostitute or just another good time girl; whilst on the other hand Lahlum thought that he worked for the Germans, or was in fact a German – albeit one with an odd accent.

From 1943 onwards, she became his girlfriend and later his fiancée. Troubled by the fact that she was being labelled a German whore by the locals, Chapman compromised his security during a boating trip on the fjord, when they had shared a bottle of cognac over lunch. Here he told her that he was a British double agent, and that the Germans would soon be sending him on a new mission to England. Lahlum was much relieved to hear that he worked for the British and at the same time told him about her work with the Norwegian resistance movement.

When Chapman was sent back to England, Lahlum was looked after by the Germans at the insistence of Chapman, and she was even paid a monthly allowance of 600 NK from the money held to his order by them and administered by Chapman's handler Stephan von Gröning.

By the time he left for England, Chapman had unofficially recruited her to MI5, and together they surveyed the German defences in and around Oslo – facts that Chapman later detailed to his British handlers upon his return. One of the sites that they reported on was the home of the Norwegian leader and traitor Vidkun Quisling.

They lived together for a while in Oslo in a flat abandoned by a Jewish family killed by the Germans, and later a small town house at Kapellveien 15, also in Oslo. When Chapman returned to England, he used Lahlum's first name, Dagmar, as his security code in all of his radio transmissions as evidence that he was still a free agent.

Although they had talked about and partly planned to open a bar or club together in Paris after the war and about having children together, when the war actually ended Chapman abandoned Lahlum, who never got over their relationship. Lahlum was branded as a "German tart" for her relationship with Chapman, as the Norwegians were unaware he was an Englishman. She was arrested on 19 May 1945 and spent six months in a prison. Her promise to Chapman never to reveal his secret led to her pleading guilty during her treason trial in 1947, and being sentenced to six months in jail.

She eventually heard from Chapman in 1997, and visited him in England. She died around 28 December 1999, suffering from Parkinson's disease, alcoholism, and malnutrition.

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Important facts

Birth century
Occupation
Double agent
Nationality
Employers
MI5
Also known as
Dagmar Mohne Hansen Lahlum

People in Dagmar Lahlum's life

Named in this biography and alive at the same time

Contemporaries

People whose lives overlapped Dagmar Lahlum's

Frequently asked questions

Who was Dagmar Lahlum?

World War II Norwegian resistance member (1923-1999)

When was Dagmar Lahlum born?

Dagmar Lahlum was born on 10 March 1923 in Eidsvoll Municipality, Sørumsand.

When did Dagmar Lahlum die?

Dagmar Lahlum died on 28 December 1999 in Oslo.

What was Dagmar Lahlum's occupation?

Dagmar Lahlum was a double agent.

What nationality was Dagmar Lahlum?

Dagmar Lahlum was Norwegian.

Sources & further reading

· Wikipedia: Dagmar Lahlum

· Wikidata: Q4587571

· DBpedia: Dagmar Lahlum

Cite this page

APA: Biography.guide. (2026). Dagmar Lahlum. https://biography.guide/dagmar-lahlum/

MLA: "Dagmar Lahlum." Biography.guide, https://biography.guide/dagmar-lahlum/.

Chicago: "Dagmar Lahlum." Biography.guide. https://biography.guide/dagmar-lahlum/.

Data last updated: 2026-09-22 · Spot an error? Report a correction.

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