<P><STRONG>Advances in the Analysis and Design of Marine Structures</STRONG> is a collection of papers presented at MARSTRUCT 2023, the 9th International Conference on Marine Structures, held in Gothenburg, Sweden, 3-5 April 2023. The conference was organised by the Division of Marine Technology, Department of Mechanics and Maritime Sciences at Chalmers University of Technology, in Gothenburg, Sweden.</P><P>The MARSTRUCT Conference series deals with Ship and Offshore Structures, addressing topics in the fields of:</P><UL><LI>Methods and tools for loads and load effects</LI><LI>Methods and tools for strength assessment</LI><LI>Experimental analysis of structures</LI><LI>Materials and fabrication of structures</LI><LI>Methods and tools for structural design and optimization</LI><LI>Structural reliability, safety, and environmental protection</LI></UL><P>The MARSTRUCT conferences series of started in Glasgow, UK in 2007, the second event of the series took place in Lisbon, Portugal in Mar