German union VC called for the strike on Thursday and said that 16 flights would be affected.
Chief Executive Officer Michael O'Leary, who softened a longstanding anti-union stance last week, is under pressure to follow through on promises to recognize unions for pilots and flight attendants as he seeks to head off labor strife.
"Ryanair management has today confirmed in writing that it now recognised Impact as the representative of the airline's pilots for collective bargaining purposes, with immediate effect", Impact said in a statement.
Germany's Cockpit (VC) said Ryanair broke off the first scheduled talks this week because it objected to two of the five union members at the table, which it said proved the company had "no desire to enter into constructive negotiations".
"In the history of the VC, there has never been a case in which the collective bargaining autonomy has been trampled on by an employer as is now the case with Ryanair".
In Germany, Cockpit said it regretted the travel disruptions and urged passengers to contact Ryanair about the impact on flights.
Just hours before the German strike call, Ryanair was able to stave off year-end travel chaos on home soil after clinching a deal with Ireland's Impact union.
Update 1.04pm: Strike action has been averted at Ryanair once again after the airline wrote to IMPACT setting out its plans to recognise the pilots' union.
Bellew described the action as a "bolt from the blue" after good dialogue with the union at a meeting on Wednesday and said he would consider working with other unions instead of VC.
The airline and the union will meet on January 3 to agree a comprehensive recognition agreement.
"IMPACT will now immediately start work to make union recognition in Ryanair a practical reality by working with management to establish a formal collective bargaining agreement, and then by using this opportunity to win improved security, terms, and working conditions for the airline's pilots", Connolly added.
However, the group cancelled the strikes after Ryanair's offer to talk about the trade unions' complaints, covering areas such as the carrier's strategy as well as pay and employment models in the fast-growing budget airline industry.
The low-priced carrier said it had sent a letter to Impact officials with proposals on pay and conditions and procedures for dealing with industrial relations disputes.
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