To uninstall MySQL from your Mac first backup your databases and then stop your MySQL server.
In the terminal run these commands.
sudo /usr/local/mysql/support-files/mysql.server stop sudo rm /usr/local/mysql sudo rm -rf /usr/local/mysql* sudo rm -rf /Library/StartupItems/MySQLCOM sudo rm -rf /Library/PreferencePanes/My* sudo rm /Library/LaunchDaemons/com.mysql.mysql.plist sudo rm -rf /Library/Receipts/mysql* sudo rm -rf /Library/Receipts/MySQL* sudo rm -rf /private/var/db/receipts/*mysql* sudo rm -rf /var/db/receipts/com.mysql.*
You may see errors if your copy of MySQL is configured differently but this will cover most or all uninstallation.
For later versions of OSX there is a great answer on superuser.com for uninstalling MySQL. The main difference in older versions of Mac OS X is the use of the
Once you are finished uninstalling MySQL restart your Mac.