Alex Salmond laid a wreath at a ceremony in Edinburgh
Events have been held across Scotland to honour servicemen and women killed in past and current conflicts.
This year marks the 90th anniversary of the end of World War I.
In Edinburgh, a two-minute silence took place at 1100 GMT at the Stone of Remembrance. A bugler and a piper marked the end of the silence.
The first minister laid a wreath at the memorial and attended a service at the city's St Giles Cathedral. Services were also held in Glasgow and Aberdeen.
Alex Salmond said: "Remembrance Sunday marks an important time of remembrance and reflection.
"It is a time when we give pause for thought and pay tribute to the many Scottish servicemen and women who have made the ultimate sacrifice in defence of our country.
"It is the sacrifice of all those who have served in the forces which preserved our values and enabled us to enjoy the freedoms which so many of us take for granted today.
The Labour leader Iain Gray attended a wreath laying ceremony in his East Lothian constituency.
Speaking at the Royal British Legion ceremony in Prestonpans, Mr Gray said: "It is so important that we always remember those servicemen and women who have made the ultimate sacrifice for their country in past and present day conflicts."
The Moderator of the General Assembly of the Church of Scotland, the Right Reverend David Lunan, said: "Remembrance Day gives each of us, from all walks of life, from every cultural background, and from every corner of the nation, the opportunity to stop, and reflect, and give silent thanks.
"For there are still those who today risk their lives for our sake."