Coccoidea (scale insects and mealybugs) are some of the most potentially detrimental pests for agriculture and ornamental plant industries in worldwide and the same in Cambodia and Laos. Scale insects were collected on branches, leaves, peduncles, petioles and fruits of hosts in January to July, 2015 and February, 2016. Previously, Coccoidea fauna of Cambodia and Laos comprise 41 and 35 species respectively. Recently we collected 25 species belong to 3 families of Coccoidea. Among these, nine species are first found in these countries; [Coccidae] Ceroplastes ceriferus (Fabricius, 1798) in Laos, Ceroplastes stellifer (Westwood 1871) in Cambodia, Milviscutulus mangiferae (Green, 1904) in Laos and Cambodia, [Pseudococcidae] Kiritshenkella sacchari (Green, 1900), Phenacoccus parvus (Morrison, 1924 ) in Laos, Palmicultor lumpurensis (Takahashi, 1951) in Cambodia, Rastrococcus invadens (Williams,1986) in Cambodia and Laos, [Diaspididae] Aulacaspis tubercularis (Newstead, 1906) in Cambodia, Aonidiella aurantii (Maskell, 1879) in Laos and Cambodia.