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<i>Agaricus</i> belongs to Agaricaceae and is one of the most well-known macrofungi, with many edible species. More than 300 <i>Agaricus</i> specimens were collected during a three-year macrofungal resource field investigation in Northeast China. Based on morphological observations and multi-gene (ITS + nrLSU + <i>tef1-a</i>) phylogenetic analyses, six new <i>Agaricus</i> species, i.e., <i>Agaricus aurantipileatus</i>, <i>A. daqinggouensis</i>, <i>A. floccularis</i>, <i>A. griseopileatus</i>, <i>A. sinoagrocyboides</i>, and <i>A. velutinosus</i>, were discovered. These new species belong to four sections within different subgenera: <i>A</i>. (subg. <i>Agaricus</i>) sect. <i>Agaricus</i>, <i>A</i>. (subg. <i>Flavoagaricus</i>) sect. <i>Arvenses</i>, <i>A</i>. (subg. <i>Minores</i>) sect. <i>Minores</i>, and <i>A</i>. (subg. <i>Pseudochitonia</i>) sect. <i>Xanthodermatei</i>. Morphological descriptions, line illustrations, and basidiomata photographs of these new species are provided, and their differences from similar species are discussed.