Rosslyn is an unincorporated locality in the northeastern corner of Arlington County, Virginia, north of Arlington National Cemetery and directly across a Potomac River from Georgetown in Washington, DC. Characterised when one of numerous "urban villages" per County, a many skyscrapers in the heavy business part of Rosslyn produce it in some manner extra urban than very much of Wa. This is part due to the Wash. ordinance which restricts building heights.

A Washington Metro Blue and Orange lines service the Rosslyn Metro stop.

Within 2003, a Virginia Baseball Stadium Authority attempted to attract the relocating Montréal Expos to Northern Virginia by proposing three Arlington County locations for the recently baseball bowl. Both web sites were in the front yard of Pentagon City; the third was the places in the southeastern corner of Rosslyn that was already occupied by quartet high-rise apartment house. Though polls appeared to show that a majority of Arlington residents supported securing a bowl in the county, the issue proved extremely dissentious. A Exposition at length moved to D.C. to be a Washington Nationals.

In a period of the Watergate scandal of the early 1970s, "Deep Throat" (W. Mark Felt) passed information to Washington Post reporter Bob Woodward in the middle of the night in an underground parking garage at 1401 Wilson Boulevard in Rosslyn.