The Wilkinson Microwave Anisotropy Probe (WMAP) three-year results are used to constraint non-minimal in ation models. Two di erent non-minimally coupled scalar eld potentials are considered to calculate the corresponding slow-roll parameters of non- minimal in ation. The results of numerical analysis of parameter space are compared with WMAP3 data to nd the appropriate new constraints on the values of the non- minimal coupling.