| Country: | POL |
| Type: | S |
| Route: | 16 |
| Map: | NowaMapaS16.svg |
| Length Km: | 14.7 |
| Length Notes: | 230km (140miles) planned |
| Terminus A: | S51 near Olsztyn |
| Terminus B: | S61 near Ełk |
| Regions: | Kuyavian-Pomeranian, Warmian-Masurian |
| Cities: | Olsztyn, Ełk |
| Previous Type: | S |
| Previous Route: | 14 |
| Next Type: | S |
| Next Route: | 17 |
Expressway S16 is a planned Polish highway. It is known that it may have briefly appeared first in Polish government long range planning documents around 2005 (there is some confusion on this point) but was subsequently dropped from construction plans. In October 2015 the route was added to the list of expressways by ministry ordinance.[1]