Ministry of Land Defence (Swedish: Lantförsvarsdepartementet) was in a broad sense, one of the eight ministries, in which the Swedish government administration was divided into. Its head was called Minister of War. The Ministry of Land Defence Department was established on 16 May 1840 and was merged with the Ministry for Naval Affairs into the newly established Ministry of Defence on 30 June 1920.
The Ministry of Land Defence was established in connection with the ministry reform in 1840. The cases, previously handled by the War Office (Krigsexpeditionen), were now divided between the Ministry of Land Defence and the Ministry for Naval Affairs. The Ministry of Land Defence's first cabinet meeting day was on 19 May 1840. According to the Royal Decree concerning the distribution of cases between the ministries on 16 May 1840 (SFS 1840 No. 14), the following cases sorted under the Ministry of Land Defence:
Cases relating to the organization and maintenance of the land defence, as well as the staff, the disposition of funds and equipment to the land defence, the construction and maintenance of fortifications, educational institutions, church and medical affairs, pension and charity facilities for the land army and associated staff; the Allotment system and Roteringsverket for the army; questions about commanding land troops for service or use for the necessary public works; the care of homes and buildings of the land defence, and The Crown's additional insight into the use of artillery foundry (styckebruk), the rifle factories and the gunpowder manufacturing; questions concerning telegraph arrangements (the telegraphic arrangements here means the military optical telegraph) in Sweden, with the exception of the individual needs of the Swedish Navy. In addition came the so-called Command Objectives (Kommandomålen), i.e. those matters of generally less importance which were determined by the king as Supreme Commander of Sweden's military force.