The title compound, [In(2)(C(9)H(11))(4)(C(4)H(10)P)(2)], contains a centrosymmetric In(2)P(2) core with short inter-molecular In-P bonds. This core has acute P-In-P and obtuse In-P-In bond angles compared with other [R(2)InPR'(2)](2) analogues, due to the presence of the bulky aromatic substituents on the In atom and the non-sterically demanding ethyl substituents on the P atom.