Patumwan Demonstration School (Thai: โรงเรียนสาธิตมหาวิทยาลัยศรีนครินทรวิโรฒ ปทุมวัน), commonly known as Satit Patumwan, is a Public Secondary school located in downtown Bangkok, Thailand. It admits secondary students (mathayom 1–6, equivalent to grades 7–12 or High School). The school entrance examination is regarded as one of the most competitive exam at the Mathayom 1 level. With its excellency in the Academics level and the Extracurricular levels, Satit Patumwan is renowned as one of the country's leading secondary school, particularly in the junior sector (mathayom 1-3).