Poland has the most people to be called Righteous Among the Nations by Yad Vashem.

Non Jews who risked their lives to save Jews by the Nazis.

The title is awarded to individuals, not peoples, nations or nationalities. However, according to the Wikipedia article on the Danish Resistance, 'The Danish resistance movement as a collective effort, rather than as individuals, has been honoured at Yad Vashem in Israel as being part of the righteous among the nations'.

Irena Sendler was a Polish Righteous Among the Nations. She saves numerous Jewish children during the holocaust.

look up the 'Righteous among Nations' in Yad Vashem, this is a list of those who they know of.