For the 2007 SourceForge.net Community Choice Awards, phpMyAdmin was present in two categories:

Best Tool or Utility for Developers (nominated)

Best Tool or Utility for SysAdmins (winner)

phpMyAdmin has won a Silver Trophy at the Third Trophees du Libre (Free Software Awards) in the category

PHP

Here is a photo from the Awards ceremony.

For the 5th Annual OS/2 World Awards, phpMyAdmin won in the category

Best PHP Application

For the first annual SourceForge.net Community Choice Awards, phpMyAdmin won the first place in two categories:

Databases

Sysadmin

phpMyAdmin was awarded the Reader's Choice Award 2006 in the category

Best PHP-Tool / Best PHP-Application

by the readers of the German PHP Magazin.

phpMyAdmin was awarded the Reader's Choice Award 2005 in the category

Best PHP-Tool / Best PHP-Application

by the readers of the German PHP Magazin.

With almost 80% of the votes, phpMyAdmin was awarded the Reader's Choice Award 2003 in the category

Best PHP-Tool / Best PHP-Application

by the readers of the German PHP Magazin as well as those of the International PHP Magazine.
You can see a photo from the Awards ceremony at the 2003 PHP International Conference.

phpMyAdmin was awarded Sourceforge.net's

Project of the month

in December 2002. Have a look at that article, if you want to learn about the early years of phpMyAdmin.