Circular knitting or knitting in the round is a form of knitting that creates a seamless tube. When knitting circularly, the knitting is cast on and the circle of stitches is joined. Knitting is worked in rounds (the equivalent of rows in flat knitting) in a spiral.

Many types of sweaters are traditionally knit in the round. Planned openings (arm holes, necks, cardigan fronts) are temporarily knitted with extra stitches, reinforced if necessary. Then the extra stitches are cut to create the opening, and are stitched with a sewing machine to prevent unraveling.

Circular knit gives a good look to the garment and makes it more impressive.

The sweater is then cut down the front to open the cardigan up. A band for buttons is added by knitting or sewing on a tightly knitted band, often embroidered with woven braid. Icelandic sweaters are also done in the round, typically. Socks are the garments most often knit in the round; double-pointed needles, with their ability to hold a smaller circumference of stitches, are still typically used.