Tiller is a former municipality in the old Sør-Trøndelag county, Norway. The municipality of Tiller existed from 1899 until its dissolution in 1964. The municipality encompassed part of the south-central part of what is now Trondheim Municipality in Trøndelag county. The municipality was generally located between the river Nidelva in the east and the Dovrebanen railway line in the west. The administrative centre was located at Heimdal, on the western edge of the municipality. The local Tiller Church was built shortly after the creation of the municipality (1901) to serve its residents.
Prior to its dissolution in 1963, the municipality was the 622nd largest by area out of the 689 municipalities in Norway. Tiller Municipality was the 274th most populous municipality in Norway with a population of about 3,328. The municipality's population density was and its population had increased by 75.3% over the previous 10-year period.
The municipality of Tiller was established on 1 January 1899 when the northwestern part of Klæbu Municipality was split off to form the new Tiller Municipality. Initially, Tiller Municipality had a population of 533.
During the 1960s, there were many municipal mergers across Norway due to the work of the Schei Committee. On 1 January 1964, Byneset Municipality (population: 2,049), Leinstrand Municipality (population: 4,193), Strinda Municipality (population: 44,600), Tiller Municipality (population: 3,595), and the city of Trondheim (population: 56,982) were merged to form the new urban Trondheim Municipality which would have a total population of 111,419.
The municipality (originally the parish) is named after the old Tilder farm () since the first Tiller Church was built there. The name is the plural form of the word which was probably the old name for a local river that flows into the large river Nidelva. The meaning of the name is uncertain. Historically, the name of the municipality was spelled Tilder. On 3 November 1917, a royal resolution changed the spelling of the name of the municipality to Tiller.
The Church of Norway had one parish () within Tiller Municipality. At the time of the municipal dissolution, it was part of the Klæbu prestegjeld and the Heimdal prosti (deanery) in the Diocese of Nidaros.
The municipality was located south of the city of Trondheim. It was bordered by Leinstrand Municipality to the west, Strinda Municipality to the north and east, Klæbu Municipality to the southeast, and Melhus Municipality to the south. The highest point in the municipality was the tall mountain SvartÃÂ¥sen, on the southern border with Melhus Municipality.
While it existed, Tiller Municipality was responsible for primary education (through 10th grade), outpatient health services, senior citizen services, welfare and other social services, zoning, economic development, and municipal roads and utilities. The municipality was governed by a municipal council of directly elected representatives. The mayor was indirectly elected by a vote of the municipal council. The municipality was under the jurisdiction of the Frostating Court of Appeal.
The municipal council of Tiller was made up of 19 representatives that were elected to four year terms. The tables below show the historical composition of the council by political party.
The mayor () of Tiller Municipality was the political leader of the municipality and the chairperson of the municipal council. The following people have held this position: