| Official Name: | Knarrlagsund |
| Other Name: | Knarrlaget |
| Settlement Type: | Village |
| Pushpin Map: | Trøndelag#Norway |
| Pushpin Label Position: | top |
| Pushpin Map Caption: | Location of the village |
| Subdivision Type: | Country |
| Subdivision Name: | Norway |
| Subdivision Name1: | Central Norway |
| Subdivision Name2: | Trøndelag |
| Subdivision Type3: | District |
| Subdivision Name3: | Fosen |
| Subdivision Type4: | Municipality |
| Subdivision Name4: | Hitra |
| Utc Offset1: | +01:00 |
| Utc Offset1 Dst: | +02:00 |
| Postal Code Type: | Post Code |
| Postal Code: | 7242 Knarrlagsund |
| Coordinates: | 63.6643°N 9.0803°W |
| Elevation M: | 14 |
| Elevation Footnotes: | [1] |
Knarrlagsund or Knarrlaget is a village on the island of Ulvøya in the municipality of Hitra in Trøndelag county, Norway. It is located on the southern part of the island about east of the village of Ulvan.
The village lies along the Knarrlagsundet strait which separates the islands of Ulvøya and Fjellværsøya. There is a bridge across the strait at Knarrlagsund.