Abstract: A plastic bag holder (10) for installation on a cabinet door (200) wherein the holder (10) comprises a mounting unit (11) including an inverted generally U-shaped bracket member (20) dimensioned to receive the top (201) of a cabinet door (200) and a support unit (12) formed integrally with the mounting unit (11) and including a generally C-shaped bag support member (40) having a base portion (41) and a pair of mirror image outwardly projecting curved support arms (42) (42′) having a generally cruciform cross-sectional configuration over a substantial portion of their respective lengths; wherein the opposed ends of the support arms (42) (42′) define a front opening in the support unit (12) that is dimensioned to allow the passage of the upper end (101) of a plastic trash bag (100) to pass through said front opening.