Park Lane is a dual carriageway road in the City of Westminster in Central London. It is part of the London Inner Ring Road and runs from Hyde Park Corner in the south to Marble Arch in the north. It separates Hyde Park to the west from Mayfair to the east. The road has a number of historically important properties and hotels and has been one of the most sought after streets in London, despite being a major traffic thoroughfare.

The road was originally a simple country lane on the boundary of Hyde Park, separated by a brick wall. Aristocratic properties appeared during the late 18th century, including Breadalbane House, Somerset House, and Londonderry House. The road grew in popularity during the 19th century after improvements to Hyde Park Corner and more affordable views of the park, which attracted the nouveau riche to the street and led to it becoming one of the most fashionable roads to live on in London. Notable residents included the 1st Duke of Westminster's residence at Grosvenor House, the Dukes of Somerset at Somerset House, and the British prime minister Benjamin Disraeli at No. 93. Other historic properties include Dorchester House, Brook House and Dudley House. In the 20th century, Park Lane became well known for its luxury hotels, particularly The Dorchester, completed in 1931, which became closely associated with eminent writers and international film stars. Flats and shops began appearing on the road, including penthouse flats. Several buildings suffered damage during World War II, yet the road still attracted significant development, including the Park Lane Hotel and the London Hilton on Park Lane, and several sports car garages. A number of properties on the road today are owned by some of the wealthiest businessmen from the Middle East and Asia. Past and current residents include the business mogul Mohamed Al-Fayed and former council leader and Lord Mayor Shirley Porter.

The road has suffered from traffic congestion since the mid-19th century. Various road enlargement schemes have taken place since then, including a major reconstruction programme in the early 1960s that transformed the road into a three-lane dual carriageway by removing a 20-acre (8.1 ha) section of Hyde Park. Improved crossings for cyclists appeared in the early 21st century. Despite the changes, property prices along the road are still among the highest in London. Its prestigious status has been commemorated by being the second-most expensive property square on the London Monopoly board.

Park Lane is about 0.7 miles (1.1 km) long, and runs north from Hyde Park Corner to Marble Arch, along the eastern flank of Hyde Park. To its east is Mayfair. The road is a primary route, classified A4202.

The street is one of the key bus corridors in Central London. It is used by London bus routes 2, 6, 13, 16, 23, 36, 74, 137, 148, 390 and night bus routes N2, N16, N74 and N137. The nearest tube stations are Hyde Park Corner on the Piccadilly line near the street's southern end and Marble Arch on the Central line near its northern end. At Brook Gate, partway along the road, there is a traffic signal controlled pedestrian and cycle crossing connecting Hyde Park to London Cycle Route 39, the recommended cycling route from the park to the West End.

What is now Park Lane was originally a track running along farm boundaries. When Hyde Park was opened in the 16th century, the lane ran north–south along its eastern boundary from Piccadilly to Marble Arch.

In the 18th century, it was known as Tyburn Lane and was separated from the park by a high wall with few properties along it, aside from a short terrace of houses approximately where Nos. 93–99 are now. Tyburn Lane took its name from the former Tyburn, a village which had declined in the 14th century. At the end of what is now Park Lane was the Tyburn gallows (also known as Tyburn Tree), London's primary public place of execution until 1783. Author Charles Knight wrote in 1843, that by 1738 "nearly the whole space between Piccadilly and Oxford Street was covered with buildings as far as Tyburn Lane, except in the south-western corner about Berkeley Square and Mayfair".

In 1741, the Kensington Turnpike Trust took over its maintenance, as coach traffic caused wear on the road surface. Breadalbane House was built on the street in 1776. On the corner with Oxford Street, Somerset House (No. 40), built in 1769–70, was successively the town house of Warren Hastings, a former Governor-General of India, the third Earl of Rosebery, and the Dukes of Somerset. The politician and entrepreneur Richard Sharp, also known as "Conversation Sharp", lived at No. 28.