Abstract A new distribution map is provided for Helicotylenchus dihystera (Cobb) Sher. Nematode. Hosts: Polyphagous. Information is given on the geographical distribution in Europe (Germany, Moldova, Netherlands, Poland, Portugal, Madeira, Mainland Finland, Romania, Russia, Far East, Southern Russia, Slovakia, Spain, Canary Islands, Mainland Spain, UK, Ukraine), Asia (Bangladesh, Bhutan, Brunei Darussalam, China, Fujian, Guangdong, Jiangsu, Nei Menggu [Nei Mongol], Sichuan, Yunnan, Zhejiang, Georgia, India, Andhra Pradesh, Assam, Bihar, Delhi, Haryana, Himachal Pradesh, Jammu and Kashmir, Jharkhand, Karnataka, Kerala, Madhya Pradesh, Manipur, Nagaland, Orissa, Punjab, Rajasthan, Sikkim, Tamil Nadu, Tripura, Uttar Pradesh, Uttarakhand, West Bengal, Indonesia, Iran, Iraq, Israel, Japan, Honshu, Kyushu, Ryukyu Archipelago, Kazakhstan, Korea Democratic People's Republic, Korea Republic, Kyrgyzstan, Malaysia, Peninsular Malaysia, Sarawak, Nepal, Pakistan, Philippines, Saudi Arabia, Singapore, Sri Lanka, Taiwan, Thailand, Turkey, Uzbekistan, Vietnam), Africa (Angola, Benin, Burkina Faso, Burundi, Cameroon, Congo Democratic Republic, Cote d'Ivoire, Egypt, Ethiopia, Gambia, Ghana, Guinea, Kenya, Liberia, Madagascar, Malawi, Mauritius, Morocco, Mozambique, Nigeria, Reunion, Rwanda, Senegal, South Africa, St Helena, Sudan, Tanzania, Togo, Zambia, Zimbabwe), North America (Canada, Ontario, Mexico, USA, Alabama, Arkansas, California, Colorado, Florida, Georgia, Hawaii, Louisiana, Maryland, Mississippi, Missouri, North Carolina, South Dakota, Texas), Central America and Caribbean (Barbados, Belize, Costa Rica, Cuba, Dominica, El Salvador, Grenada, Guadeloupe, Guatemala, Jamaica, Martinique, Montserrat, Panama, Puerto Rico, St Kitts-Nevis, St Lucia, St Vincent and Grenadines, Trinidad and Tobago), South America (Bolivia, Brazil, Acre, Bahia, Ceara, Espirito Santo, Goias, Mato Grosso do Sul, Minas Gerais, Para, Parana, Pernambuco, Rio de Janeiro, Rio Grande do Sul, Santa Catarina, Sao Paulo, Chile, Colombia, Easter Island, French Guiana, Peru, Venezuela), Oceania (American Samoa, Australia, New South Wales, Northern Territory, Queensland, South Australia, Victoria, Western Australia, New Zealand, Niue, Papua New Guinea, Samoa, Solomon Islands, Tonga).