The pictures feature a different member of crew for each month, posing in a bikini, with their name and a destination printed on the page.
The low-cost carrier has added a joke page that takes a jibe at BA, showing an older woman wearing a swimming costume. She is holding a sign that says "We’re off our trolleys!" in one hand, and a cigarette in the other.
Proceeds from the 2011 Ryanair Cabin Crew Charity Calendar will be given to Tafel, the organisation that provides food to people in need throughout Germany, particularly children and teenagers who suffer through poverty and malnutrition.
The airline has been creating calendars to raise money for charity since 2008, and has so far raised more than €400,000 for various organisations.
This will be the first year a German charity has been chosen, partly due to strong sales of Ryanair’s 2010 calendar, which offloaded 30% of its stock in Germany last year.
Michael O’Leary, chief executive of Ryanair, said: "Ryanair’s cabin crew stunners are delighted once again to strip off for charity and this year they’re doing it for the Tafel charity in Germany.
"We hope that the 2011 charity calendar will raise up to €100,000 to help Tafel deliver even more food to people in need throughout Germany."
When asked whether the women featured in the calendar were actually air hostesses or not, he added: "Yes, they are real crew. Anyone who knows Ryanair knows we would never pay for models."
The calendar, which was shot in Fuertaventura, can be purchased on board Ryanair flights, from the Tafel charity in Germany or from www.ryanaircalendar.com.