Lanny Jaya Regency is a regency (kabupaten) located in the Indonesian province of Highland Papua. It covers an area of 6,077.4 km², and had a population of 148,522 at the 2010 Census and 196,399 at the 2020 Census; the official estimate as at mid 2025 was 211,330 (comprising 113,360 males and 97,460 females). The administrative centre is the town of Tiom.

In 2010 the Lanny Jaya Regency comprised ten districts (distrik), listed below with their areas and their populations at the 2010 Census, together with a list of the additional districts formed from parts of the original districts from 2013 onwards.

Since 2013, the number of districts has been raised to thirty-nine by the splitting of existing districts. These thirty-nine are listed below with their areas and their populations at the 2020 Census, and the official estimates as at mid 2022. The table also includes the location of the district administrative centres, the number of administrative villages in each district (totaling 354 rural kampung and 1 urban kelurahan - the latter being the town of Bokon in Tiom District), and its post code.