| Official Name: | Hullo |
| Settlement Type: | Village |
| Pushpin Map: | Estonia |
| Subdivision Type: | Country |
| Subdivision Name: |  Estonia |
| Subdivision Type1: | County |
| Subdivision Name1: | Lääne County |
| Subdivision Type2: | Parish |
| Subdivision Name2: | Vormsi Parish |
| Timezone: | EET |
| Utc Offset: | +2 |
| Timezone Dst: | EEST |
| Utc Offset Dst: | +3 |
Hullo is a village on the fourth largest island of Estonia, Vormsi, in Lääne County, Estonia.[1] It is the administrative centre of Vormsi Parish. The population of Hullo was estimated to be 245[2] as of January 1, 2010.
Island inhabitants date back to the 13th century. During most of its history the island was inhabited by Estonian Swedes ("rannarootslased" in Estonian, or "coastal Swedes" in English), whose population reached 3,000 before World War II. During the war, nearly all of Vormsi's population, including Hullo's; were evacuated to Sweden.
Two churches are located on the island: a protestant church and an orthodox church.