Disclosed herein are herbicidal compositions comprising a synergistic, herbicidally effective amount of (a) haloxyfop or an agriculturally acceptable salt or ester thereof, and (b) an acetolactate synthase (ALS) inhibitor or an agriculturally acceptable salt or ester thereof. Also disclosed herein are methods of controlling undesirable vegetation which comprise applying to vegetation or an area adjacent the vegetation or applying to soil or water to prevent the emergence or growth of vegetation (a) haloxyfop or an agriculturally acceptable salt or ester thereof, and (b) an ALS inhibitor or an agriculturally acceptable salt or ester thereof, wherein (a) and (b) are each added in an amount sufficient to provide a synergistic herbicidal effect.