Birkholm is a small
Danish island off the southern coast of
Funen in
Ærø Municipality. With an area of just , as of 1 January 2010 it has a population of 10. The flat, low-lying island is just over long and
above sea level at its highest point, though the protective dykes are high. It can be reached by post boat from
Marstal on Ærø in 25 minutes.