Theory predicts that funding conditions faced by financial intermediaries are an important limit to arbitrage. We identify and measure the value of funding liquidity from the crosssection of Treasury securities. To validate our interpretation, we establish linkages with funding conditions in the repo market, the shadow banking sector, and the overall economy. Looking at asset pricing implications, we find that increases in funding liquidity predict lower risk premia for all Treasury securities but higher risk premia on LIBOR loans, swap contracts, and corporate bonds. The impact of funding conditions on interest rates is large and pervasive throughout crises and normal times.