The flag of San Marino consists of a horizontal bicolour of the colour white along the top of the flag and the colour sky blue along the bottom of the flag. At the centre of the flag is the coat of arms of San Marino.
The colours of the flag are said to represent the sky (sky blue) and the clouds and snow over Mt Titano (white). Alternatively, the colours of the flag have been described as representing liberty (sky blue) and peace (white).
The flag of San Marino was officially adopted on 6 April 1862.
The flag's ratio is 3:4.