Sixtus Lanner (12 May 1934 – 13 July 2022) was an Austrian farmer, engineer, and politician who served in the National Council of Austria as a member of the Austrian People's Party (ÖVP). Lanner served in parliament for a total of 25 years from 1971 until 1996. Lanner was also the secretary-general of the ÖVP from 1976 to 1981. Described as a Bauernbua (peasant-boy) from the Tyrolean Unterland, Lanner was a staunch advocate for rural affairs, and has been described as the "father of rural life" in Austria. Lanner was regarded as an influential member of the ÖVP.