Welcome to the 22nd edition of the International Couette Taylor Workshop (ICTW23), to be held in Barcelona (28th-30th June 2023), hosted by UPC. In this edition, we celebrate the centennial of the publication of G.I. Taylor's paper entitled 'Stability of a Viscous Liquid contained between Two Rotating Cylinders', Phil. Trans. Roy. Soc. A, 223 (1923). Over a century, this paper has been a cornerstone work on which hydrodynamic stability theory has been developed.

Following the structure of former editions of the ICTW23, the conference will be organized as a series of selected key-note talks, oral and poster presentations, covering experimental, theoretical and computational investigations on hydrodynamic instabilities. The scope of the conference will include (among other topics):

• Taylor-Couette flows
• Rayleigh-Bénard instabilities (thermal buoyancy, binary mixtures, etc.)
• Rayleigh-Taylor and Dean instabilities
• Instabilities in wall-bounded shear and boundary layer flows
• Stratified flows
• Coherent flow structures
• Geophysical and atmospheric flow instabilities
• MHD flows

We very much look forward to seeing you in Barcelona next year!