The synthesis, crystal structure, and magnetic properties of three new manganese(III) clusters are reported, [Mn-3(mu O-3)(phpzH)(3)(MeOH)(3)(OAc)] (1), [Mn-3(mu(3)-O)(phpzMe)(3)(MeOH)(3)(OAc)] center dot 1.5MeOH (2), and [Mn-3(mu(3)-O)(phpzH)(3)(MeOH)(4)-(N-3)] center dot MeOH (3) (H(2)phpzH = 3(5)-(2-hydroxyphenyl)-pyrazole and H(2)phpzMe = 3(5)-(2-hydroxyphenyl)-5(3)methylpyrazole). Complexes 1-3 consist of a triangle of manganese(ill) ions with an oxido-center bridge and three ligands, phpzR(2-) (R = H, Me) that form a plane with the metal ions. All the complexes contain the same core with the general formula [Mn-3(mu(3)-O)(phpzR)(3)](+). Methanol molecules and additional bridging ligands, that is, acetate (complexes 1 and 2) and azide (complex 3), are at the terminal positions. Temperature dependent magnetic susceptibility studies indicate the presence of predominant antiferromagnetic intramolecular interactions between manganese(III) ions in 1 and 3, while both antiferromagnetic and ferromagnetic intramolecular interactions are operative in 2.