Flaxseed meal is a by-product of the flax processing industry. There is potential to use FSM as an ingredient for swine; however, prior to including it as a regular ingredient, its full nutritional profile must be determined. This includes determination of the DE and NE values, as well as determining the chemical composition of the meal and the availability of minerals such as phosphorus. FSM contains a high level of total P; however, up to 70% of this is bound by phytic acid and is thus unavailable for absorption by monogastric animals such as pigs. Evaluation of the effects of including microbial phytase into FSM based diets is important when looking at P availability. The first objective was to determine the DE of FSM in both sows and growing pigs through digestibility trials, allowing for the estimation of NE. Individually housed pigs were fed diets containing 0 or 30% FSM (6 gestating sows (200-300 kg) and 8 barrows (70 kg) per diet). FSM was included at the expense of the basal diet, which consisted of barley, wheat, soybean meal, and premix. Celite was included as an indigestible marker. The second objective was to determine the effects of including exogenous phytase (Phyzyme XP 5000G; EC 3.1.3.26, Danisco Animal Nutrition) on P availability. Barrows with average weights of 45 kg were assigned to one of 5 dietary treatments (8 pigs per treatment), each containing 30% FSM with increasing levels of exogenous phytase (0, 575, 1185, 2400 and 2570 FTU/kg diet). The semi-synthetic basal diet was composed of pea starch (50%), Solka-floc® (4%), casein (6%), dextrose (6%), vitamin/mineral premix (2%), canola oil (2%) and FSM (30%). This ensured that FSM was the only source of P, and celite was included as an indigestible marker. It was concluded that flaxseed meal contains, on average, 3520 kcal DE/kg and 2445 kcal NE/kg dry matter. There was no difference between age groups in terms of the DE or NE value of FSM. The crude protein content of FSM is 31.6% DM and the ether extract content is 12.2%. Inclusion of microbial phytase in diets containing 30% FSM significantly improves the apparent digestibility of P, which reduces the need to rely on dietary P supplementation. Inclusion of 575 FTU/kg diet phytase accounted for half of the overall improvement in P digestibility.