Seven projects reached final investment decision this year, financing a total of 3.7 gigawatts of new capacity.
The UK accounted for nearly three-quarters of the new investments.
The volume of new grid-connected installations in the first half of 2016 was 511MW, 78% down on the same period in 2015, but that is expected to pick up next year and toward 2020.
"The record investment numbers show a clear industry commitment to offshore wind. We expect installations will pick up significantly in 2017 but there are a lot of challenges out there still on offshore wind,” WindEurope CEO Giles Dickson said.
“Not least the uncertainty over future volumes and regulation in many key markets for the period after 2020. We're a long way from being able to say ‘job done’ on offshore wind."
Total installed offshore wind capacity in Europe now stands at 11,538MW across 82 wind farms in 11 countries.
Only Germany (258MW) and the Netherlands (253MW) added new capacity in the first six months.
The average size of the 114 new turbines installed was 4.8MW, up from 4.2MW a year ago.
In June, energy ministers from nine European countries signed a memorandum of understanding and work program to enhance their cooperation on offshore wind.
In parallel 11 energy companies signed a declaration to reduce offshore wind costs to below EUR80/MWh by 2025, but that will require an annual build-out of 4-7GW of offshore wind from 2021.
"The costs of offshore wind are falling, but we need healthy volumes in the market to sustain this,”
“The current pipeline of projects is not enough, and the commitments member states have so far made for beyond 2020 fall well short of what's needed.
“This risks undermining Europe's competitive position in offshore wind.
“We're number one today with over 90% of the world's capacity, but the US and China are now moving to rapidly expand their offshore wind investments.
"Clearer deployment goals and long-term visibility on tender volumes and timetables will mean a strong industry and supply chain - and competitive bidding leading to lower costs. It will also mean lower costs of capital, and with offshore wind so capex heavy, this is key to total cost reduction.
“Coordination of national tenders ¬¬– which the nine countries committed to in their recent MoU - will also help."