Selggrund ehk Selggrundi madal on madal Soome lahes.
Selggrundi madal asub rannajoonest Rutja ja Karepa küla juures 4–7 meremiili ehk 7–13 km põhja pool. Selggrundist loodes asub Snegi madal, Selggrundist 4 meremiili kirdes asuvad Uhtju saared.
Selggrundi madal on lai ja laugenõlvaline, vee sügavus madala lael on 7–10 meetrit.
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