The 24-year-old German, winner of the last two World Cup campaigns as well as a four-time world champion, got his hunt for a hat-trick off to a rocky start as he had to settle for third in Lillehammer.
But Loch was back to his formidable best in the second World Cup of the season as he led from start to finish to take the victory.
Loch opened up with a first run of 50.495 seconds and improved that to 50.383 in his second for his 13th World Cup triumph in 29 races.
Compatriot David Moeller was 0.174 further back in second, while Italian Dominik Fischnaller claimed bronze – with Great Britain’s Adam Rosen finishing down in 27th.
Victory means Loch joins Moeller and Fischnaller at the top the overall World Cup rankings, all three sitting on 170 points.
There was plenty more for Germany to cheer as their women collected a clean sweep of the medals in the women's event, with Natalie Geisenberger claiming her second victory of the season.
Geisenberger opened up her World Cup campaign with a win in Lillehammer and repeated the trick in Igls as she came home in 1:20.135 minutes.
Olympic champion Tatjana Huefner was 0.032 seconds further back in second while Anke Wischnewski completed an all German podium as she finished in 1:20.311 minutes.
- Sports & Recreation
- Dominik Fischnaller