Yes.
The Tom Mackenzie Loon Works Mistral is a 15' tripping canoe with 29" beam at gunwales and 26" at the waterline. They were all made mostly with Dacron rather than canvas to cut down on weight. Members here, Brightraven currently owns one and stevet used to own one. It is, of course, no longer in production and would have to be found used.
The 15-6
Stewart River Traveler, in current production, is less than 30" in all beam dimensions and can be made with Dacron, canvas, or a poly/canvas hybrid fabric. Stewart River also makes shorter solo canoes with narrow beams.
Jerry Stelmok at
Island Falls makes the narrow Willow and Willow Wisp. Patrick Corry has one of these.