Higashi-ku was a ward in Hamamatsu, Japan, located in the east-central part of the city. It is the second smallest of the seven wards of Hamamatsu in terms of area, after Naka-ku. It is bordered by Hamakita-ku, Kita-ku, Minami-ku, and Naka-ku.

The Enshū Railway Line, officially the Railway Line , is a Japanese railway line in Shizuoka Prefecture, running north from Shin Hamamatsu, Naka Ward through Nishi Kajima, Tenryū Ward, all within Hamamatsu. This is the only railway line Enshū Railway (Entetsu) operates. The line has a nickname Nishi Kajima Line , while locals often call it Akaden, referring to the color of the EMUs. The line accepts NicePass, a smart card ticketing system, as well as ET Card, a magnetic card ticketing system.