Four simple, sensitive, accurate and precise visible spectrophotometric methods (A, B, C and D) have been developed for the quantitative estimation of acenocoumarol in bulk drug and pharmaceutical formulations (tablets). Method A is based on the reaction of reduced acenocoumarol with aromatic aldehyde, paradimethylamino cinnamaldehyde (PDACA) producing colored Schiff’s ba ses at the 7 max 527.5 nm and. Method B is based on the reaction of reduced acenocoumarol with aromatic aldehyde, paradimethylaminobenzaldehyde (PDAB) in acidic condition producing colored Schiff’s bases having 7 max at 441.5 nm. Method C is based on the oxi dation followed by coupling reaction of reduced acenocoumarol with 3-methyl-2-benzothiazolinone hydrazone (MBTH) in presence of ceric ammonium sulphate to form green colored chromogens at 7 max 585.0 nm. Method D is based on the reaction of reduced acenocoumarol with Folin’s (1, 2-naphthoquinone-4-sulphonate) reagent to form brown colored chromogen with 7 max at 480.0 nm. Beer’s law is obeyed in the concentration range of 2-10 >g/mL for Method A, 5-25 >g/mL for method B, 20-100 >g/mL for Method C and 2-12 > g/mL for Method D. The reduction of acenocoumarol is carried out with zinc dust and hydrochloric acid at room temperature in methanol. The results obtained with proposed methods are in good agreement with labeled amounts when marketed pharmaceutical formul ations are analyzed. The results of analysis have been validated statistically and by recovery studies