Sunday Sunny Mill Valley Groove Day is an album by Frank Black and the Catholics, recorded in 2000. Because Black was not completely happy with the recording sessions, he decided against a commercial release. However, he did hand out several copies of the album at shows, which fans uploaded to the internet. Several tracks were later used as B-sides or rerecorded for the albums Devil's Workshop (2002), Black Letter Days (2002) and Honeycomb (2005). In 2015, many (though not all) of the tracks were included on the Frank Black and the Catholics: The Complete Recordings box set.