That list by midnight is a good one, but - no offense intended - it is not truly all the adaptations ever made of her six major novels. This site
http://www.jasna.org/film/index.html has a more complete list with the year made and including, under "and more," movies like The Jane Austen Book Club. This one from the Jane Austen Society is an excellent list.
All 6 major novels (Sense and Sensibility, Pride and Prejudice, Mansfield Park, Emma, Northanger Abbey, Persuasion) by Jane Austen have, indeed, been made into movies, some shown in movie theaters, some on TV. I've never seen her unfinished Sanditon or The Watsons adapted, nor Lady Susan or her works from childhood.
Edit: In case you have a problem with the link, here is the general overview of the adaptations of her six novels, minus the "and more" category, without all the description the site gives:
Emma adaptations:
-1996 (A&E, Kate Beckinsale)
-1996 (Hollywood, Gwyneth Paltrow)
-1995 (Clueless, Alicia Silverstone)
-1972 (BBC)
Mansfield Park adaptations:
-2007 (Masterpiece Theatre)
-1999 (Hollywood, Frances O'Connor)
-1983 (BBC)
Northanger Abbey adaptations:
-2007 (Masterpiece Theatre)
-1987 (BBC)
Persuasion Adaptations:
-2007 (Masterpiece Theatre)
-1995 (Hollywood, Amanda Root)
-1971 (Grenada Television)
Pride and Prejudice adaptations:
-2005 (Hollywood, Keira Knightley)
-2004 (Bride and Prejudice, Bollywood)
-2003 (modern day)
-1995 (BBC & A&E miniseries, Colin Firth)
-1980 (BBC)
-1940 (Hollywood)
Sense and Sensibility adaptations:
-2008 (BBC/Masterpiece)
-2000 (I Have Found It, Bollywood)
-1995 (Hollywood, Emma Thompson)
-1980 (BBC)
-1971 (BBC)