Donald Mohler is an American politician and former educator from Maryland and a member of the Democratic Party.

In 1971, he joined the social studies faculty of St. Mark's School in Catonsville.

He spent nearly 30 years as a teacher, guidance counselor and administrator in Baltimore County Public Schools.

[1] In 2004, he joined the office of County Executive James T. Smith Jr. as communications director and stayed on after the 2010 election as chief of staff to County Executive Kevin Kamenetz.

[1] After Kamenetz's death in May 2018, the Baltimore County Council selected Mohler to serve out the final six months of his term.