| Hörgársveit | |
| Settlement Type: | Municipality |
| Mapsize: | 250px |
| Pushpin Map: | Iceland |
| Coordinates: | 65.4572°N -18.8278°W |
| Subdivision Type: | Country |
| Subdivision Name: | Iceland |
| Subdivision Type1: | Region |
| Subdivision Name1: | Northeastern Region |
| Subdivision Type2: | Constituency |
| Subdivision Name2: | Northeast Constituency |
| Leader Title1: | Manager |
| Leader Name1: | Snorri Finnlaugsson |
| Unit Pref: | Metric |
| Area Total Km2: | 893 |
| Population Total: | 802 |
| Population Density Km2: | 0.63 |
| Code1 Name: | Municipal number |
| Code1 Info: | 6515 |
Hörgársveit (pronounced as /is/) is a municipality located in north-central Iceland, in Northeastern Region. Its seat is the village of Lónsbakki in Icelandic pronounced as /ˈlounsˌpahcɪ/.
The former municipality of Hörgárbyggð in Icelandic pronounced as /ˈhœrkˌaurˌpɪɣθ/ was formed on 1 January 2001 by the union of the municipalities of Skriða in Icelandic pronounced as /ˈskrɪːða/ (Skriðuhreppur in Icelandic pronounced as /ˈskrɪːðʏˌr̥ɛhpʏr̥/), Öxnadalur in Icelandic pronounced as /ˈœkstnaˌtaːlʏr̥/ (Öxnadalshreppur in Icelandic pronounced as /ˈœkstnaˌtalsˌr̥ɛhpʏr̥/) and Glæsibær in Icelandic pronounced as /ˈklaiːsɪˌpaiːr̥/ (Glæsibæjarhreppur in Icelandic pronounced as /ˈklaiːsɪˌpaiːjar̥ˌr̥ɛhpʏr̥/). In 2010 Hörgárbyggð merged with the municipality of Arnarnes in Icelandic pronounced as /ˈa(r)tnarˌnɛːs/ (Arnarneshreppur in Icelandic pronounced as /ˈa(r)tnarˌnɛsˌr̥ɛhpʏr̥/) to form the current municipality of Hörgársveit.
Located on the Eyjafjörður, to the north of Akureyri, Hörgársveit is made up of several villages, principally Þelamörk in Icelandic pronounced as /ˈθɛːlaˌmœr̥k/, Lónsbakki (115 inhabitants) and Hjalteyri (37 inhabitants), the seat of the former municipality of Arnarnes.