A gas burner assembly (10), in particular for a gas cooking hob, comprising a burner cap (12) and a burner body (14). The burner cap (12) is arranged or arrangeable upon the burner body (14). The burner cap (12) includes a plurality of flame ports (20). The flame ports (20) are formed within a horizontal portion or within a substantially horizontal portion of the burner cap (12). The burner body (14) includes a mixing chamber (22), a Venturi pipe (24), at least one air inlet (26), a gas injector (28) and a gas supply channel (36). At least the mixing chamber (22), the Venturi pipe (24), the at least one air inlet (26) and the gas supply channel (36) form a single-piece part. The flame ports (20) of the burner cap (12) are arranged above the mixing chamber (22) of the burner body (14), when the burner cap (12) is arranged upon the burner body (14).