Garwin is a city in Tama County, Iowa, United States.

Various new towns were established along the tracks, but the Garwin, Iowa was the first railroad station beyond Toledo.

Several landowners were interested in selling their land for the purpose of establishing the new town, including George Rider and John Galvizer.

After much controversy, these two men won out, and a message was sent to Toledo that read: “‘G’ (for Glavizer) and ‘R’ (for Rider) win.” Its recipients misconstrued the message, reading the word “Garwin” instead- and the city finally had a name.

[6] According to the United States Census Bureau, the city has a total area of 1.01 square miles (2.62 km2), all land.

Services provided by The City of Garwin include an ambulance service, a fire department, Green Mountain Garwin Junior/Senior High School, a public library, and a park.

Located four miles northwest of town is Union Grove State Park.

Student athletes can now compete in football, volleyball, cross country, boys' and girls' basketball, boys' and girls' track, boys' and girls' golf, baseball, softball, and share wrestling with East Marshall High School and swimming with Marshalltown High School.

The Wolverines claimed the 1987 Class A Iowa State Football Championship in their first year as a combined school.

GMG beat Schleswig 20–17 in overtime on a Robbie Sinclair touchdown run.

GMG, and Garwin HS before it, also have a rich boys' basketball tradition.

Garwin won many conference titles and made two runs to the Iowa State Basketball Tournament.

Garwin first made the 1978 Class 1A State Tournament, losing to Lake View-Auburn 54–44.

The 2007-08 girls' basketball team, under coach Jay Freese, posted a record of 20-3 and made the program's first ever regional final.