The Capital Line is a light rail line on the Edmonton LRT system. The line operates from northeast Edmonton to the south. Operated by the Edmonton Transit Service, the line provides access to Downtown Edmonton and the University of Alberta. The Capital Line currently consists of fifteen stations, six of which are underground. Seven stations are shared with the Metro Line.

On April 22, 1978, the line opened between Belvedere and Central stations. The original line was 6.9 km (4.3 mi) long and opened in time for the 1978 Commonwealth Games. At the time (and for another 37 years) the system consisted solely of the single line. It was not named the Capital Line until 2013 when expansion plans were revealed for additional lines.

The 1980s were a decade of expansion for the Capital Line. It expanded northwards toward Clareview in 1981, and westwards toward Bay and Corona, under the downtown core in 1983. Another underground extension was completed in 1989 with the opening of Grandin, now known as Government Centre.

One station opened in the 1990s, University, in August 1992. The underground station was connected to the downtown leg by the Dudley B. Menzies Bridge.

During the 2000s, under the mayorship of Stephen Mandel, the Capital Line was expanded southward. Health Sciences opened in 2006, the first new station in 14 years. In 2009, McKernan/Belgravia and South Campus opened, followed by Southgate and Century Park in 2010.

After the completion of the south leg of the Capital Line, city council shifted their efforts towards the Metro Line and Valley Line.

The extension will be constructed in phases, with phase 1 extending the line from Century Park to Heritage Valley North and phase 2 extending the line from Heritage Valley North to Desrochers.

The phase 1 extension continues to be high floor LRT and is 4.5 km (2.8 mi) long and includes: