The ‘2023 ICTP Winter College on Optics: Terahertz Optics and Photonics’ will be held in Trieste on February 6^th-17^th, 2023. It will address a broad range of important technologies and applications that are made possible by the material properties in the spectral range confined between the millimeter wave and far-infrared part of the electromagnetic spectrum. While the 11^th November deadline for students applying for grants is now closed, European students who wish to participate without scholarships can still send their application. More information on http://indico.ictp.it/event/10058/.