To the Editor: Routine surveillance of disease incidence is a core function of public health programs (1). Surveillance systems for mental disorders, however, remain underdeveloped despite strong temporal variation in the incidence of these disorders. Recently Google, the most commonly used search engine in the world, launched “Google Trends.” This Web site allows the public to gather statistics on queries made to the Google.com search engine. To the extent that depression—a key risk factor for suicide—and suicidal ideation presage an increased risk of suicide completion, surveillance of Google Trends queries may assist with focused bursts of suicide prevention efforts. We tested whether suicide-related Google searches predict the monthly incidence of completed suicides. We examined England and Wales because of their publicly available suicide database and their high societal cost of premature death from suicide ($9.2 billion in 2009) (2).