Haven't seen...
Day of the Groundhog (2004)
Groundhog Day: The Weight of Time (2002) (Short)
Groundhog Play (1956) (Short)
Groundhogs (2015) (Short)
Groundhog's Day (2016)
The Groundhogs: Live at the Astoria (1998)
The Nut Job (2014)
The O.C. S4, Ep12 "The Groundhog Day" (2007) (TV)
One Meat Brawl (1947) (Short)
Springtime Serenade (1935) (Short)
Summertime (1935) (Short)
Winter (1930) (Short)
Wonder Pets! S3, Ep14 "Help the Groundhog!" (2011)

Coming Soon...
Groundhog (2017)
Meeting MacGuffin (2017)