Two new species (A. kenneallyi Cowan & Maslin and A. manipularis Cowan & Maslin) and one new subspecies (A. retivenea F. Muell. subsp. clandestina Cowan & Maslin) are described. Acacia lanigera Cunn. is distinguished from A. venulosa Benth. and is viewed as comprising three varieties, var. lanigera, var. gracilipes Benth. and var. whanii (F. Muell. ex Benth.) Pescott (syn. A. whanii F. Muell. ex Benth.). In addition, lectotypes for several taxa are designated herein: A. subporosa var. linearis Benth. (the base name for A. cognata Domin), A. excelsa Benth., A. hemignosta F. Muell., A. lanigera Cunn., A. lanigera var. gracilipes Benth., A. leucophylla Lindley (= A. pendula Cunn. ex Don), A. praelongata F. Muell., A. subporosa F. Muell., and A. trinervata var. brevifolia. A note concerning the binomial A. sericata Cunn. ex Benth. is also included and discussions are presented concerning A. farinosa Lindley, A. latescens Benth. and A. trinervata Sieber ex DC.