(Dorval, QC, Canada) I photograph this insect in one of the parks in Montreal.
It was found on a leaf. It has 2 antena and 6 legs. It is brown in color.
Your insect is a brown stink bug. It is in the subfamily Pentatominae…it is probably a stink bug in the genus Euschistus ( http://bugguide.net/node/view/7207/bgimage) not Halyomorpha ( http://bugguide.net/node/view/9806/bgimage) as Anonymous suggests.
Without seeing it, we could not be positive…one photo can’t show all the detail needed for positive ID. Just goes to show how difficult ID can be.
With all that said this insect does feed on plant juices, so it can be a pest, especially if it feeds on fruits.
There are many out in the fall feeding on berries and other fruits both flower seed pod fruits as well as fruits we eat. As they feed on the plants juice, this dries out the fruits and also deforms the fruits and damages seeds.
They are found over most of North America.