| Country: | SGP |
| Type: | E |
| Route: | SLE |
| Seletar Expressway | |
| Map: | Expressways and Semi-expressways of Singapore 2012.png |
| Map Notes: | Seletar Expressway is labelled in single dark blue line |
| Length Km: | 11 |
| Length Round: | 1 |
| Direction A: | West |
| Direction B: | East |
| Terminus A: | Kranji (BKE) |
| Terminus B: | Seletar (CTE, TPE) |
| Regions: | Woodlands, Mandai, Kranji, Seletar, Yio Chu Kang, Yishun, Sengkang (West) |
| History: | Completed in 1998 |
| Junction: | BKE, NSC, CTE, TPE |
| Translation: | |
The Seletar Expressway (Abbreviation: SLE) is a highway in Singapore that traverses the northern end of the island and joins the Central Expressway (CTE) and the Tampines Expressway (TPE) in Seletar to the Bukit Timah Expressway (BKE) in Kranji.
In the 1980s, the SLE was proposed to link BKE in Kranji to the junction of TPE and CTE in Yio Chu Kang.[1] In 1983, it was announced that SLE would only be built after work on the northern expansion of CTE from Toa Payoh to Yio Chu Kang was completed.[2]
The first phase of the construction of SLE consisted of a stretch between Yio Chu Kang and Upper Thomson Road and was opened on 24 March 1990.[3]
Later on, this stretch was extended on 24 March 1990 to connect SLE and CTE. Later, it was extended from Upper Thomson Road to the BKE. It replaced various roads — Lorong Handalan, Lorong Lentor, Lorong Selangin and Lorong Hablor.
The SLE is a six-lane dual carriageway. The Upper Thomson Road - BKE extension was opened in two parts: from BKE to Woodlands Avenue 2 on 5 November 1995, and from Woodlands Avenue 2 to Upper Thomson Road on 22 February 1998. Construction of the second phase began in 1992. The interchange of SLE and BKE was completed in 1994. The third stage of construction, completing in July 1996 from Woodlands Avenue 2 to Lorong Gambas. The final phase involved the construction from Lorong Gambas to Upper Thomson Road. The last sector of this expressway which opened was the last completed expressway project in Singapore until the opening of a section of the Kallang–Paya Lebar Expressway on 28 October 2007.
It had the largest clearing of the roads in the history — Lorong Gambas, Jalan Ulu Sembawang, and some dirt tracks.
| No. | Eastbound exit to road (destinations) | Interchange | Type | No. | Westbound exit to road (destinations) |
| End of expressway (CTE) | Yio Chu Kang I/C | SPUI | Start of expressway | ||
| 1A | Yio Chu Kang Road | ||||
| 1B | TPE (PIE, Changi) and Seletar West Link | Seletar I/C | Directional T | 1 | TPE (PIE/ECP) |
| 3 | Lentor Avenue (City) and Ang Mo Kio Avenue 6 | Lentor I/C | Diamond | 3 | Lentor Avenue (Yishun) |
| 5 | Upper Thomson Road | Upper Thomson I/C | SPUI | 5 | Upper Thomson Road |
| 8B | Mandai Avenue | Sembawang I/C | Diamond | 8A | Mandai Road and Mandai Avenue |
| 9 | Woodlands Avenue 12 | Ulu Sembawang I/C | Seagull | 9 | Woodlands Avenue 12 |
| 10 | Woodlands Avenue 2 | Marsiling I/C | Trumpet | 10 | Woodlands Avenue 2 |
| Start of expressway | Turf Club I/C | Double Trumpet | 11 | BKE (PIE) and Turf Club Avenue | |
| End of expressway (BKE (Johor)) | |||||