We demonstrate a laser-diode pumped efficient triwavelength laser at about $1.06\mathrm{\mu m}$ with a Nd-doped yttrium gallium garnet crystal for the first time, to our knowledge. Continuous wave output power of $7.15\mathrm{W}$ was achieved under an absorbed pump power of $14.1\mathrm{W}$ , corresponding to the slope efficiency of 52.7%. With Cr:YAG as the saturable absorber, passive Q-switching performance was obtained. The shortest pulse width, largest pulse energy, and highest peak power were obtained at $3.1\mathrm{ns}$ , $153.8\mathrm{\mu J}$ , and $46.6\mathrm{kW}$ , respectively. The laser spectrum was found to be a triwavelength, with respective wavelengths of 1062.1, 1060.3, and $1058.9\mathrm{nm}$ , and three laser transitions were assigned.