Dear Readers, I am pleased to announce the successful conclusion of the 2023 International Congress on Ultrasonics in Beijing (the 2023 ICU BEIJING), organized and hosted by the International Congress on Ultrasonics (ICU), the Institute of Acoustics in the Chinese Academy of Sciences (IACAS), and the Acoustical Society of China (ASC) in September 2023. The 2023 ICU Beijing aimed to bring together professionals and experts from academia and industry across all disciplines of ultrasonics, encompassing fundamental science and applications such as engineering material characterization and quality inspection, chemical and biological US-based monitoring, medical imaging, and therapy, among others. This congress offered more than 830 presentations covering various domains of ultrasonics and their applications. The program included 7 keynote presentations from world experts, 63 invited lectures, 547 oral contributions, and around 220 posters. For further information, please visit https://www.2021icu.org.cn/. As usual, there will be a proceeding of the 2023 ICU BEIJING after the congress. Through collaborations with the International Organization Committee and the Scientific Committee of the 2023 ICU Beijing, etc., we have selected 800 peer-reviewed abstracts that were presented at the congress. These presentations reflected the state-of-the-art scientific advancements and technological progress in ultrasonic scientific research and applications in recent years. Due to the impact of COVID-19, there is still much high-quality research work not included. After the completion of the congress, we selected 202 submitted papers by our peer reviewers and scientific committee which will be published in the Journal of Physics Conference Series (JPCS) as the proceeding of the 2023 ICU BEIJING. On behalf of the Organizing Committee, the Scientific Committee of the 2023 ICU BEIJING, and the ICU Board Members, I would like to extend my heartfelt appreciation to our Session Organizers, Plenary speakers, Session invited speakers, peer reviewers, IOP Publishers of the JPCS, as well as all those who have contributed to this proceeding. It is your participation and support that make the proceeding available. Yours sincerely, Xiuming Wang President of the 2023 ICU BEIJING Chair of the International Congress on Ultrasonics List of Scientific Committee Members of the Proceeding of 2023 ICU BEIJING are available in this Pdf.