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- Larry Mac Duff
- Archer MacMackin
- Hanford MacNider
- Cletus Madsen
- Joe Magrane
- Mahaska
- Maryann Mahaffey
- Dennis Mahony §
- Anna Malle §
- Arabella Mansfield
- Stuart Margolin
- Beth Marion
- Glenn Martin
- Bernard Masterson
- Jerry Mathers
- James Matheson (composer)
- David Maxwell §
- Elsa Maxwell
- Jesse May
- Wiley Mayne
- F. L. Maytag §
- Dan McCarney
- The McCaughey septuplets
- Al McCoy
- Greg McDermott
- William John McGee
- George McGill
- Charles McGraw
- Keli McGregor
- Sean McLaughlin
- William H. McMaster
- Cal McVey
- Stu Mead
- Carl Meinberg
- Michael Joseph Melloy
- Denis Menke
- Sebastian Menke
- William Menster
- Iris Meredith
- Russel Merrill
- Samuel Merrill §
- Nancy Metcalf
- Loren Meyer
- Hugh Millen
- Glenn Miller
- Samuel Freeman Miller §
- Robert Millikan §
- Jason Momoa §
- Ted Monachino
- Michelle Monaghan
- Jordan Monroe
- Constance Moore
- Frank A. Moore §
- Hap Moran
- Peggy Moran
- Karen Morley
- Carol Morris
- Phil Morris
- Allie Morrison
- Karen Morrow §
- Michael Mosley
- Dow Mossman
- John Mott
- Marvin Mottet
- Kate Mulgrew
- Richard L. Murphy
- Charles Murray
- Brandon Myers
- Virginia A. Myers §
Read more about this topic: List Of People From Iowa