there isn't one when you take it to get the oil changed you can ask them to check the fill hole if it has one, if its not leaking don't worry about it until you need to change it at it's suggested milege.
There is a diPstick at the front on the transmission differential
The 2010 Subaru Outback has a 6-speed manual.
The 2008 Subaru Outback has a 5-speed manual.
The 2012 Subaru Outback has a 6-speed manual.
The 2011 Subaru Outback has a 6-speed manual.
The 2004 Subaru Outback has a 5-speed manual.
The 2013 Subaru Outback has a 6-speed manual.
The 2006 Subaru Outback has a 5-speed manual.
The 2001 Subaru Outback has a 5-speed manual.
The 2009 Subaru Outback has a 5-speed manual.
The 2007 Subaru Outback has a 5-speed manual.
The 2002 Subaru Outback has a 5-speed manual.