| Ølstykke | |
| Settlement Type: | Former municipality |
| Subdivision Type: | Country |
| Subdivision Name: | Denmark |
| Subdivision Type2: | Region |
| Subdivision Name2: | Capital Region of Denmark |
| Subdivision Type4: | Municipality |
| Seat: | Ølstykke |
| Seat Type: | Seat |
| Pushpin Map: | Denmark |
| Pushpin Relief: | 1 |
| Coordinates: | 55.7833°N 21°W |
| Population As Of: | 2014 |
| Population Total: | 16,681 |
| Population Density Km2: | auto |
| Timezone1: | CET |
| Utc Offset1: | +1 |
| Timezone1 Dst: | CEST |
| Utc Offset1 Dst: | +2 |
| Postal Code Type: | Postal codes |
| Postal Code: | 3650 |
Ølstykke is a former municipality in Region Hovedstaden. The former Ølstykke municipality covered an area of 29 km2, and had a total population of 15,358 (2005). Its last mayor was Svend Kjærgaard, a member of the Venstre (Liberal Party) political party.
On 1 January 2007, Ølstykke municipality ceased to exist as the result of Kommunalreformen ("The Municipality Reform" of 2007). It was merged with Ledøje-Smørum and Stenløse municipalities to form the new Egedal municipality. This created a municipality with an area of 126 km2 and a total population of 39,267 (2005).