The Waterfront West LRT (WWLRT) is a proposed streetcar line in Toronto, Ontario, Canada. The WWLRT is currently part of a City project called the Waterfront Transit Reset which also includes the East Bayfront LRT. The WWLRT was initially proposed as part of the Transit City plan to expand transit services offered by the Toronto Transit Commission that was announced March 16, 2007. The new line was to use existing parts of the Toronto streetcar system, extending from Union station to Long Branch Loop via Exhibition Place.
 The originally proposed WWLRT was abandoned when Mayor of Toronto Rob Ford cancelled the entire Transit City project on December 1, 2010. However, an October 2015 city report recommended that the project be reconsidered in the context of other Waterfront transit projects, a mandate which resulted in the Waterfront Transit Reset study. In November 2017, the study produced a series of recommendations which, if they were all implemented, would result in a Waterfront West line quite similar to the Transit City proposal.
 In April 2019, the City of Toronto decided to proceed to procurement and construction on the recommendation designated the "Exhibition Place–Dufferin Gate Loop streetcar connection", describing it as "a priority segment of the Waterfront Transit Network Plan".
 Announced on March 16, 2007, the WWLRT was part of Mayor David Miller's Transit City proposal. As the shortest and least expensive Transit City line, it was expected to cost approximately $540 million. The line was to open in four stages and be completed by 2015 as the third of the seven Transit City lines after the Sheppard East LRT and Etobicoke–Finch West LRT (later reconstituted as the Finch West LRT). Unlike the other Transit City lines, this service would share infrastructure and 4 ft 10+7⁄8 in (1,495 mm) track gauge with the streetcar system; the other LRTs would not be compatible with the city's streetcars and use larger LRT vehicles on 1,435 mm (4 ft 8+1⁄2 in) standard gauge tracking. In 2008, the WWLRT was included in Metrolinx's regional transportation plan The Big Move as part of the 15-year horizon.
 After taking office in December 2010, Mayor Rob Ford announced cancellation of the line; this decision was never brought to City Council for approval and the line's status remained in question. Funding had not been secured for the project. In January 2013, the project was shelved by Toronto city officials.
 On October 9, 2015, a city staff report titled Waterfront Transit Reset said that there was a clear need for a "reset" because recent waterfront transit planning had been ad hoc and incremental, resulting in a lack of a comprehensive plan for the transit network to respond to the rapid changes occurring along the waterfront. In the report, the Deputy City Manager recommended that:
 The Waterfront Transit Reset report also said:
 On November 13, 2017, a report about the Waterfront Transit Reset was presented to the TTC board. It included a number of recommendations to improve streetcar service along the lakeshore between Long Branch and Leslie Street. If the recommendations pertaining to streetcar service between Long Branch and Union station had been implemented, the resultant route would have had a strong resemblance to the original Waterfront West LRT.
 In April 2019, the City of Toronto decided that the "Exhibition Loop–Dufferin Loop streetcar connection" project would proceed to procurement and construction in 2019/2020 as "a priority segment of the Waterfront Transit Network Plan".
 There are two versions of the route: the Transit City version of 2007 and the Waterfront Transit Reset version of 2017. Both are essentially the same route with only a few differences.
 The Waterfront West line would run for about 11 kilometres (6.8 mi). The western terminus would be Long Branch Loop at Long Branch GO Station in Etobicoke. The line would run along Lake Shore Boulevard West, following the existing 501 Queen route through Humber Loop, and along the Queensway. A new right of way would parallel King Street West east of Roncesvalles Avenue and follow the rail corridor through the existing Exhibition Loop area. It would continue via the existing 509 Harbourfront route to Union station.
 In the 2007 version, the Etobicoke portion of the line would travel entirely in an exclusive right-of-way; the 2017 version would use mixed traffic west of Park Lawn Road. The 2007 version considered using new tracks along Fort York Boulevard and Bremner Boulevard to avoid complex intersections such as at Fleet Street and Bathurst Street; the 2017 version would use existing tracks on Fleet Street and Queens Quay West.
 The Waterfront Transit Reset study resulted in a number of recommendations to improve streetcar service along the lakeshore between Long Branch and Union station. Most of the recommendations could be implemented independently. The recommendations from Long Branch to Bay Street included:
 In April 2019, the TTC proposed the following features to connect Exhibition Loop to Dufferin Gate Loop at Exhibition Place: