Chloro organotin(IV) dipyrazolinates of the type RSnCl(C15H12N2OX)(2) [where C15H12N2OX = 3(2'-Hydroxyphenyl)-5(4-X-phenyl)pyrazoline {where X = H (a); CH3(b); OCH3 (c); Cl (d) and R = Me, Pr-n and Ph}] were synthesised by the reaction of RSnCl3 with sodium salt of pyrazolines in 1:2 molar ratio, in anhydrous benzene. These newly synthesised derivatives were characterised by elemental analysis (C, H, N, Cl and Sn), molecular weight measurement and spectral [IR and multinuclear NMR (H-1, C-13 and Sn-119)] studies. The bidentate behaviour of the pyrazoline ligands was confirmed by IR, H-1 and C-13 NMR spectral data. An octahedral structure around the tin(IV) atom for RSnCl(C15H12N2OX)(2) is suggested.