Lanthanum oxobromotungstate LaWO4Br was prepared by solid-state synthesis. The compound was studied by various methods of physicochemical analysis: chemical, crystal-optical, differential-thermal, X-ray diffraction, scanning electronic microscopy, and second optical harmonic generation. The crystals of the compound are orthorhombic, space group Pbcm. The unit cell parameters for LaWO4Br were determined: a = 5.912(1) Å, b = 7.931(2) Å, c = 19.728(2) Å, V = 925.2(2) Å3. Selected physicochemical parameters of the compounds were studied. Pyroelectric properties of the compounds were found over a wide temperature range.