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Helophilus latifrons, the Broad-headed Marsh Fly, is a species of syrphid fly observed throughout the United states, in lower Canada and the mountains on Mexico. Hoverflies can remain nearly motionless in flight. The adults are also known as flower flies for they are commonly found on flowers from which they get both energy-giving nectar and protein rich pollen. The larvae are aquatic feeding on decaying vegetation.

The soft fuzz and black-and-yellow stripes of this flower fly help it mimic bees and wasps.

It was once very common, but its numbers have declined significantly, as much as 80% to 90%. However, it is still widespread and relatively common. It is the most common Helophilus species in Minnesota. The larvae, known as rat-tailed maggots, are aquatic and feed on decaying vegetation.