Swiss federal police said in a decision published Friday that Sellner "is banned from entering the Swiss and Liechtenstein territories from October 10-27 2024".
The 35-year-old had been invited by the far-right group Junge Tat, known for its anti-immigration and anti-Islamic views, to speak at a conference in Zurich on October 19.
He can appeal the entry ban at Switzerland's federal administrative court, the police said.
Police spokesman Christoph Gnagi told AFP that Swiss law "provides for entry bans as a preventive police measure when there are indications of a threat to internal or external security".
Swiss police had prevented Sellner from addressing a far-right gathering organised by Junge Tat near Zurich in March and deported him.
He was also barred from entering Germany in March, following a meeting with the far-right AfD that sparked an uproar in the country. But a German court overturned the entry ban in May.
Sellner's Identitarian Movement espouses the far-right white nationalist Great Replacement conspiracy theory, according to which white Europeans are being deliberately supplanted by non-white immigrants.
One of Sellner's main proposals is that of "remigration," expelling those without Austrian nationality "who are long-term unemployed" or that are living in "unassimilated parallel societies".
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