Gas burner for domestic use, of the type comprising at least one Venturi effect mixer in fluid connection with at least one combustion mixture distribution chamber and with at least one flame spreader associated with said distribution chamber, in addition to first means for preventing flame propagation of the fluid flow splitting type. Advantageously, the above-mentioned first preventing means is arranged downstream of the Venturi effect mixer and upstream of the combustion mixture distribution chamber, separating said Venturi effect mixer from the distribution chamber.