Lynndyl is a town in Millard County, Utah, United States.

According to the United States Census Bureau, the town has a total area of 3.5 square miles (9.1 km2), all land.

For many years it was the location of a fork in the Los Angeles and Salt Lake Railroad where one branch proceeded to Provo via Nephi and Santaquin and the other to Salt Lake City via Tooele.

13.3% of all households were made up of individuals, and 4.4% had someone living alone who was 65 years of age or older.

There were 11.1% of families and 7.5% of the population living below the poverty line, including 13.0% of under eighteens and none of those over 64.