Theodore is an unincorporated area and census-designated place (CDP) in Mobile County, Alabama, United States.

Prior to 1900 this area was known as "Clements", but it is now named for William Theodore Hieronymous, a sawmill operator and postmaster.

It did not appear again on the census until 1980 when it was designated a CDP (census-designated place).

There were 2,697 housing units at an average density of 226.3 per square mile (87.4/km2).

19.3% of all households were made up of individuals, and 7.1% had someone living alone who was 65 years of age or older.

There were 2,473 housing units at an average density of 309.1 per square mile (119.3/km2).

21.8% of all households were made up of individuals, and 7.9% had someone living alone who was 65 years of age or older.

As of the 2020 United States census, there were 6,270 people, 2,035 households, and 1,465 families residing in the CDP.

[9] Two elementary schools, Mary Borroughs and Nan Gray Davis, serve sections of the CDP.