An basud o baybay (Ingles: sand) iyo an sarong natural na nagaganap na tipasi na materyal na binibilog kan makinis na binangang gapo asin mga partikula kan mineral.
Ini natutukoy sa paagi kan sukol, na mas pinong kaysa sa graba asin maragkot kaysa sa silt. Mapupwede man na maisihan an basud sa sarong klase nin daga; i.e., sarong daga na naglalaman nin labi sa 85 porsiyento nin mga partikula na basud sa paagi kan masa.
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