Last Thursday (November 7th, 2024) the very first Christmas market started the season in Vienna.
This is the official list of this year's Christmas markets in Vienna; the preceding number denotes the respective city borough.
(1) Rathausplatz: https://www.christkindlmarkt.at/en/
(1) Stephansplatz: https://www.weihnachtsdorf.at/en_us/
(1) Freyung: https://altwiener-markt.at/en/christmas
(1) Am Hof: https://www.weihnachtsmarkt-hof.at/
(1) Maria-Theresien-Platz: https://www.weihnachtsdorf.at/en_us/
(3) Schloss Belvedere: https://www.weihnachtsdorf.at/en_us/
(4) Karlskirche/Resselpark: https://divinaart.at/en/
(7) Spittelberg: https://spittelberg.at/en/
(9) Campus Uni Wien: https://www.weihnachtsdorf.at/en_us/
(10) Viktor-Adler-Markt: https://vzfm.at/projekt/adventmarkt-im-10-bezirk-in-der-fussgaengerzone-favoritenstrasse/
(12) Meidlinger Platzl: https://www.adventguide.at/de/maerkte/details/meidlinger-christkindlmarkt.html
(13) Schloss Schönbrunn: https://www.weihnachtsmarkt-schoenbrunn.at/en
(18) Türkenschanzpark: https://www.weihnachtimpark.at/
(21) Franz-Jonas-Platz: https://www.wissenswertes.at/advent-floridsdorf
As the City of Vienna has chosen new operators for certain markets there will be some changes in comparison to previous years, e.g. there will be an ice rink in front of Schönbrunn Palace.
Emily, a local expert for Christmas markets, had described them already in great detail during previous years:
https://community.ricksteves.com/travel-forum/austria/a-local-s-take-on-15-christmas-markets-in-vienna-2019