PM Modi arrived in Berlin on Friday night on the German leg of his European tour which included visits to Sweden and UK.
The prime minister met German Chancellor Angela Merkel at the German Chancellery in Berlin. The two heads of the state will sit down for dinner later tonight.
Earlier, the PM Modi joined other heads of government for the leaders' retreat at Windsor Castle, which concluded the Commonwealth Heads of Government Meeting (CHOGM) in the UK.
The closed-door meetings in Windsor comprised the informal segment of CHOGM, where the leaders meet without any pre-set agenda and without the presence of their close aides.
The retreat marks an end to the week-long summit in Britain, which started on Monday with forums on the theme of business, women, youth and civil society.
Prime Minister Modi addressed the second plenary of the executive session, during which he reiterated India's focus on small island developing nations of the organisation and delivering "demand-driven, rather than donor-driven" assistance to the organisation's smaller member states.