Sir Benjamin Baker KCB KCMG FRS FRSE (31 March 1840 – 19 May 1907) was an eminent English civil engineer who worked in mid to late Victorian era. He helped develop the early underground railways in London with Sir John Fowler, but he is best known for his work on the Forth Bridge. He made many other notable contributions to civil engineering, including his work as an expert witness at the public inquiry into the Tay Rail Bridge disaster. Later, he helped design and build the first Aswan dam.