This is a list of underpasses and tunnels in Singapore. Only vehicular underpasses and tunnels with official names are shown below.
| Underpass | Road | Crosses under | |
|---|---|---|---|
| Adam Underpass | Slip road connecting PIE to Lornie Highway | Lornie Road | |
| Anak Bukit Underpass | Jalan Anak Bukit | Jalan Jurong Kechil | |
| Ang Mo Kio Underpass | Ang Mo Kio Avenue 3, Hougang Avenue 2 | Yio Chu Kang Road | |
| Braddell Underpass | Braddell Road | Central Expressway (CTE), Braddell Flyover | |
| Bukit Timah Underpass | Bukit Timah Road | Adam Road, Farrer Road, Farrer Flyover | |
| Clementi Avenue 6 Underpass | Clementi Avenue 6 | Commonwealth Avenue West | |
| Dunearn Underpass | Dunearn Road | Adam Road, Farrer Road, Farrer Flyover | |
| Farrer Underpass | Farrer Road, Queensway | Holland Road, Holland Flyover | |
| Lornie Underpass | Lornie Road | Lornie Highway | |
| Nicoll Underpass | Slip road connecting Sims Way and KPE to Nicoll Highway | Sims Way, Nicoll Highway | |
| Queensway Underpass | Queensway | Commonwealth Avenue | |
| Rifle Range Underpass | Slip road connecting PIE to Jalan Anak Bukit | Pan Island Expressway (PIE) | |
| Sime Underpass | Lornie Road, Kheam Hock Road | Lornie Highway | |
| T4 Underpass | T4 Underpass | Airport Boulevard, T4 Boulevard | |
| Tuas Underpass | Pan Island Expressway (PIE) | Jalan Ahmad Ibrahim, Ayer Rajah Expressway (AYE), Tuas Road, Tuas Flyover | |
| Tuas West Underpass | Ayer Rajah Expressway (AYE) | Tuas West Road | |
| Upper Paya Lebar Underpass | Upper Paya Lebar Road | Bartley Road, Bartley Road East, Bartley Viaduct | |
| Woodleigh Underpass | Bartley Road, Braddell Road | Upper Serangoon Road, Serangoon Viaduct |
| Tunnel | Road | Crosses under | |
|---|---|---|---|
| Chin Swee Tunnel | Central Expressway (CTE) | Orchard Road, Penang Road, Clemenceau Avenue, Oxley Flyover, River Valley Road, Singapore River, Merchant Road, Havelock Road, Chin Swee Road | |
| Fort Canning Tunnel | Fort Canning Link | Canning Rise, Fort Canning Road | |
| Kampong Java Tunnel | Central Expressway (CTE) | Bukit Timah Road, Cavenagh Road | |
| KPE Tunnel | Kallang-Paya Lebar Expressway (KPE) | Kallang, Geylang, Hougang, Paya Lebar | |
| MCE Tunnel | Marina Coastal Expressway (MCE) | Marina South, Marina Channel, Marina East, Kallang | |
| Sentosa Gateway Tunnel | Sentosa Gateway | Telok Blangah Road, West Coast Highway, Kampong Bahru Road | |
| Woodsville Tunnel | Bendemeer Road, MacPherson Road, Serangoon Road, Upper Serangoon Road | Jalan Kolam Ayer, Jalan Toa Payoh, Pan Island Expressway (PIE), Woodsville Flyover |