<jats:title>Abstract</jats:title><jats:p>Three new polybrominated 1<jats:italic>H</jats:italic>‐indoles, compounds <jats:bold>1</jats:bold>–<jats:bold>3</jats:bold>, and three new aristolane sesquiterpenes, compounds <jats:bold>4</jats:bold>–<jats:bold>6</jats:bold>, were isolated from the marine red alga <jats:italic>Laurencia similis</jats:italic>, together with seven known natural products. Their structures were elucidated on the basis of detailed spectroscopic and mass‐spectrometric analyses, as well as by comparison with literature data.