1924-27

John S. Morris (PSO for a time; renamed Portland Orchestral Society)

1927-32

none (PMO operated under the aegis of Portland Music Commission)

1932

Benjamin E. Haskell (died in office, December - 1932)

1933

Clinton W. Graffam, Sr. (died in office, November - 1933)

1933-37

Percy D. Mitchell

1937-42*

Harold M. Lawrence

1942-46

Clinton W. Graffam, Jr.

1946-51

Harold M. Lawrence

1951-54

Norman C. Balabas

1954-56

Lawrence Hatch

1956-59

Jean Gannett Williams

1959-61

Horace K. Sowles, Jr.

1961-63

Mrs. Sidney W. Thaxter

1963-66

Leonard M. Nelson

1966-68

Jeremiah Newbury

1968-70

Louis Benoit

1970-72

Harold E. Woodsum, Jr

1972-74

Bernard J. Lewis

1974-76

Curtis Scribner

1976-78

Harold Pachios

1978-80

Philips Lewis

1980-82

Peter Plumb

1982-84

Joan Woodsum

1984-86

Joel C. Martin

1986-87

Edwin R. Nelson

1987-89

Charles A. Harvey, Jr

1989-91

John I. Riddle

1991-93

Mary P. Nelson

1993-95

Jean Ginn Marvin

1995-96

L. Kinvin Wroth

1996-98

Vincent E. Furey, Jr

1998-00

Donald L. McDowell

2000-02

Karen Foster

2002-04

Peter Haynes

2004-06

Jeffrey Kane

2006-08

Deborah Galarneau

2008-11

Gordon Gayer

2011-13

Debby Hammond

2013-15

Sam Parkhill

2015-16

Harper Collins