Olaf Jarl Alstad (1854–1947) was a Norwegian architect.
He parents were Mathias Olaus Alstad and Louise Amalie Steen.
[2] Olaf Jarl Alstad was a student at Trondhjem's technical college, graduating in 1874.
He studied freehand drawing, shadow theory, and perspective.
From 1900 to 1915 he was a member of the board of the Society for the Preservation of Ancient Norwegian Monuments.