We are pleased to announce the 9th KIAS Workshop on Cosmology and Structure Formation, to be held from 2nd November to 6th November 2020 at the Korea Institute for Advanced Study (KIAS), Seoul. This workshop aims to bring together the world-wide researchers for open and active discussions about recent challenging issues on cosmology and structure formation. The workshop program is made including theoretical cosmology, cosmological observations, computational astrophysics, galaxy formation and evolution, gravitational lensing, and the artificial intelligence application to various astrophysical problems. The conference will be held on campus at KIAS in a vibrant suburb of Seoul close to the city center. We also utilize the online conference platform (Zoom) to enable participation from those who have travel restrictions. In the registration form, you can choose whether you will attend the conference on-site or through Zoom. Registration is now open, and the deadline for submission of contributed talks is 9th September 2020. Further information can be found on the conference web page.