This dataset provides the radial velocity measurements (Table 2) and minima times (Table 4) of 11 TESS contact binaries. The radial velocity data were derived from medium-resolution spectra obtained by the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) in its Medium-Resolution Spectroscopic Survey (MRS) mode. The minima times data (Table 4) were collected from multiple surveys, including SuperWASP, ASAS-SN, VarAstro, AAVSO, TESS, and ZTF. All minima times have been uniformly converted to BJD, with cycle numbers and O−C residuals provided.