Coat of arms left|thumb|The medieval Alstahaug Church left|thumb|The old parsonage at Alstahaug is protected The coat of arms was granted on 8 August 1986. The official blazon is "Argent, a fess engrailed azure" (). This means the arms have a field (background) that has a tincture of argent which means it is commonly colored white, but if it is made out of metal, then silver is used. The charge is a fess (bar) with engrailed edges running horizontally through the arms. The design symbolizes the Seven Sisters (), a row of mountains in the area, mirrored in the clear waters of the fjord. The arms were designed by Jarle E. Henriksen.
coAt of aRms leFt|thumb|tHE MEdiEVal alstahauG cHUrCh Left|tHUmb|tHe Old parsoNAgE At alstAhaug iS pRotected thE CoAT of Arms WaS GrANTeD oN 8 auGUsT 1986 ThE oFFIcIal bLAzoN iS "aRgEnT A FEss ENgraIleD azure" () THIS MeAns tHE armS have a Field (bAckGroUnD) thaT Has a tincTuRE OF argenT wHich means it Is cOMmOnLY colOrEd WhiTe BuT If it is made ouT of MetAl tHen sIlveR is USed The cHARGe is a fess (BaR) With eNgraIlEd edgeS RunnING hORizoNTaLLy thrOuGh The aRMs the desIgn sYmBolizES ThE seven Sisters () a roW oF mOuntAiNs In thE aREa miRrored IN thE cleaR wAterS of The fJord tHe aRms WEre DEsiGned by JarLe e hEnrikseN