The amount of municipal waste leachate produced during the process of composting of solid waste refuse is high, due to its higher moisture content. Therefore, improper collection methods and uses can cause environmental problems. This study was conducted in order to investigate the effect of municipal soild waste compost leachate (MSWC leachate) on yield and yield components of wheat (Triticum aestivum) with four irrigation treatments of different leachate-to-water ratios (T0=water, T20=20%,T40=40%, T60=60% V/V basis) in a completely randomized design with three replications under greenhouse conditions. Results obtained indicate the significant effect of different leachate to water ratios on ECe, pH, TN, available P and OC of soil, yield and yield components of wheat. ECe, TN, available P and OC of soil increased, but the soil pH decreased with MSWC leachate concentrations and the maximum was recorded for the T60 treatment. The number of grains per spike (more than 1.4 times), plant height(13.8%), grain weight per spike (more than 1.6 times), grain and straw yields (more than 1.5 and 1.6 times, respectively), and the ratio of grain weight to straw weight in a leachate-to-water ratio of 20/80 (T20) treatment increased when compared to their respective controls and the other treatments (p≤0.05). Spike length and 1000 grain weight in a leachate-to-water ratio of 20/80 (T20) treatment were not significantly different from their respective controls. Increasing the leachate concentrations to more than 20%, reduced yield and yield components of wheat compared to control, probably due to a soil salinity increase and its negative impacts on the parameters studied (p≤0.05).