Messler has worked in the Westport school district for the past 10 years, most recently as the assistant principal for curriculum and instruction at Coleytown Elementary School, where she worked for four years.
"She had a very successful career in business and decided to become an educator," Board of Education Chairwoman Elaine Whitney said when announcing the appointment at Monday's board meeting.
"The Board of Education conducted an extensive search" for this position "and we are glad to say we have selected one of our own." Whitney added.
Messler becomes the school's principal effective July 1, Whitney said. Her salary was not disclosed Monday night.
"I am excited by this opportunity and to get to know the staff and students at Saugatuck," Messler said in accepting the position.
She later said she is "looking forward to this new challenge."
"Beth" Messler, 40, a Trumbull resident, is married and the mother of two young children, ages 6 and 3.
Messler replaces Julie Droller as the Saugatuck principal. Droller was hired March 25 as the school district's new director of elementary education. She will take over from Cynthia Gilchrest, who is also retiring at the end of this academic year.
Also hired on March 25 was James D'Amico, currently the department chairman for social studies for grades 6 to 12. He is the school district's new director of secondary education, replacing Lis Comm, who also is retiring at the end of this academic year.