Since 1970, the Ports and Harbours Bureau, Ministry of Land, Infrastructure, Transport and Tourism and its associated organizations have been conducting the Nationwide Ocean Wave information network for Ports and HArbourS (NOWPHAS). Among these organizaions, the Port and Airport Research Institute (PARI) is playing an important role to process and analyze the wave records obtained at the network, and to present the wave statistics in a series of annual reports. This Technical Note of PARI covers the wave data obtained throughout the year 2011 at the 75 network stations (25 stations on the coast of the Sea of Japan, 4 stations on the East China Sea, 1 station on the Sea of Okhotsk, and 45 stations on the Pacific Ocean). Fifteen GPS buoys, which can measure the vertical motion of the mooring buoys due to sea surface elevations every one second by using the RTK-GPS technolgy, are included at the stations on the coast of the Pacific Ocean. Among these 75 stations, the significant wave is obtained every 20 minutes at 67 stations and every 2 hours at 8 stations. This note presents the statistics on long period waves at 38 stations and the frequency spectrum analysis at 49 stations. In 2011, the record of the local highest significant wave at 10 wave observation stations were updated.