Harald Ingemann Jensen (12 June 1879[1] – 13 July 1966) was an Australian geologist, academic, public servant and political candidate.

He was employed as an assistant demonstrator to Edgeworth David before becoming the first Macleay fellow of the Linnean Society of New South Wales in 1905, allowing him to travel extensively in the Pacific, including to Fiji, Samoa, Tonga and New Zealand.

[2] Appointed director of mines in the Northern Territory in August 1912, he found himself in opposition to the Administrator, John Gilruth, who had him demoted in 1915, although he remained chief geologist.

Jensen wrote to the minister for external affairs and territories and precipitated a royal commission into Gilruth's administration, which ultimately found against Jensen (a public service inquiry later exonerated him of making disloyal comments) and led to his forced resignation in September 1915.

Divorced in 1937, in 1938 he was appointed leader of the Queensland section of the Aerial Geological and Geophysical Survey of North Australia, which continued until 1940.