The Friendship Heights–Southeast Line, designated as Routes 30N or 30S, is a defunct daily bus routes operated by the Washington Metropolitan Area Transit Authority between Friendship Heights station of the Red Line of the Washington Metro and Naylor Road station or Southern Avenue station of the Green Line of the Washington Metro.

This line provided service from Friendship Heights, operating through most of NW and SE DC and ending in Southern Prince Georges County via a one bus ride.

In 2008, WMATA launched a study on the Pennsylvania Avenue line to improve services and to reduce delays and bus bunchings.

[5][6] Additionally, a new Route 33 was introduced to operate alongside the 31 between Friendship Heights and Federal Triangle station replacing the discontinued portions of the 32 and 36 and adding additional service to the 30N and 30S as both routes will operate hourly services.

Routes 32 and 36 were shorten to terminate at Foggy Bottom–GWU station/Potomac Park at Virginia Avenue & E Street NW.

These changes were made due to overcrowding, bus bunching, simplifying the 30s lines, and to reduce delays.

[7] During the COVID-19 pandemic, routes 30N and 30S operated on their weekend schedule during the weekdays beginning on March 16, 2020.

[10] During WMATAs 2021 fiscal year budget, it was proposed for both the 30N and 30S to be fully eliminated and to be replaced by routes 31, 32, 33, 36, and 39 order to improve on-time performance and simplify the 30s line.