Medical officer of health, medical health officer  or district medical officer, is a title and commonly used for the senior government official of a health department or agency, usually at a municipal, county/district, state/province, or regional level. The post is held by a physician who serves to advise and lead a team of public health professionals such as environmental health officers and public health nurses on matters of public health importance. The equivalent senior health official at the national level is often referred to as the Chief Medical Officer  , although the title varies across countries, for example known as the Surgeon General in the United States and the Chief Public Health Officer in Canada.   Canada  All communities are under the jurisdiction of an MOH. In Canada, some provinces like Ontario , have set up legislation so that one individual is named Chief Medical Officer of Health for the province and has powers to issue guidance, to issue provincial orders, and to coordinate public health responses with MOHs across jurisdictions. In some provinces such as British Columbia, the Chief MOH for the province is referred to as the Provincial Health Officer. The roles of the MOH vary across jurisdictions, but always include responsibilities related to public health and safety, and may include the following functions:Role of the Medical Officer of Health. Health Canada, accessed 16 January 2012. responsibility for communicable disease control; assessing environmental threats to human health; providing leadership in public health emergency situations; overseeing health surveillance activities; providing expert advise on health promotion and disease prevention; recommending and developing public health policy. On 1 May 2020 during the COVID-19 pandemic  , it came to light that the Chief Medical Officer of Health (CMOH) for Haldimand County and Norfolk County, both of which lie on the shores of Lake Erie, had issued an order under the Ontario Health Protection and Promotion Act which reads: United States 
Medical officer of health, medical health officer , chief health officer, chief public health officer or district medical officer, is a title and commonly used for the senior government official of a health department or agency, usually at a municipal, county/district, state/province, or regional level. The post is held by a physician who serves to advise and lead a team of public health professionals such as environmental health officers and public health nurses on matters of public health importance. The equivalent senior health official at the national level is often referred to as the Chief Medical Officer (CMO) , although the title varies across countries, for example known as the Surgeon General in the United States and the Chief Public Health Officer in Canada. Australia The national senior adviser on health matters is known as the Chief Medical Officer, while those at state and territory level are mostly known as Chief Health officer (CHO), with one CMO and one Chief Public Health Officer. (Contains correction to Farhart article.) Canada The Chief Public Health Officer of Canada is the national senior health official. All communities are under the jurisdiction of an MOH. Ontario has set up legislation so that one individual is named Chief Medical Officer of Health for the province and has powers to issue guidance, to issue provincial orders, and to coordinate public health responses with MOHs across jurisdictions. In British Columbia, the Chief MOH for the province is referred to as the Provincial Health Officer. The roles of the MOH vary across jurisdictions, but always include responsibilities related to public health and safety, and may include the following functions:Role of the Medical Officer of Health. Health Canada, accessed 16 January 2012. responsibility for communicable disease control; assessing environmental threats to human health; providing leadership in public health emergency situations; overseeing health surveillance activities; providing expert advice on health promotion and disease prevention; recommending and developing public health policy. On 1 May 2020 during the COVID-19 pandemic in Canada , it came to light that the Chief Medical Officer of Health (CMOH) for Haldimand County and Norfolk County, both of which lie on the shores of Lake Erie, had issued an order under the Ontario Health Protection and Promotion Act which reads: United States The Surgeon General of the United States is the senior health officer in the United States.
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, chief health officer, chief public health officer
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(CMO)
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Australia
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The national senior adviser on health matters is known as the Chief Medical Officer, while those at state and territory level are mostly known as Chief Health officer (CHO), with one CMO and one Chief Public Health Officer. (Contains correction to Farhart article.)
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The Chief Public Health Officer of Canada is the national senior health official.
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In Canada, some provinces like Ontario , have
Ontario has
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In some provinces such as
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advise
advice
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in Canada
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The Surgeon General of the United States is the senior health officer in the United States.