Gilby is a city in Grand Forks County, North Dakota, United States.

According to the United States Census Bureau, the city has a total area of 0.17 square miles (0.44 km2), all land.

There were 110 housing units at an average density of 647.1 per square mile (249.8/km2).

26.5% of all households were made up of individuals, and 6.1% had someone living alone who was 65 years of age or older.

31.3% of all households were made up of individuals, and 18.8% had someone living alone who was 65 years of age or older.

None of the families and 5.1% of the population were living below the poverty line, including no under eighteens and 11.6% of those over 64.