11th International Seminar on Medical Physics (ISMP) 2019 is a conference of Malaysian Association of Medical Physics (MAMP). The conference will be held on 7-8th Nov 2019 in Istana Hotel, Kuala Lumpur, Malaysia and the theme is “Medical Physics: Together We Make an Impact”. The conference was known as National Seminar on Medical Physics (NSMP) until its 9th edition. Since the 10th anniversary, the conference is renamed the International Conference on Medical Physics to recognise the diversity of the nationality of the conference speakers and attendees in the previous conference series. We hope that the change also will encourage more international participants especially from the neighbouring countries of Malaysia and beyond to come together in fostering Medical Physics research and clinical practice in this region. The conference accepts abstracts for oral and poster presentations in the topics of physics and technology of radiotherapy, nuclear medicine and medical imaging. As in the previous conference, accepted papers will be published in the Journal of Physics: Conference Series (JPCS) by the Institute of Physics UK. Past conference publication is available here: http://iopscience.iop.org/article/10.1088/1742-6596/851/1/011001 . Building upon the track record of the past conferences thus far, we hope that the 11th conference will become an excellent meeting place for scientists and clinicians from various disciplines working to advance medical physics research and clinical practice in Malaysia and elsewhere.