Sonnet 18 of Shall I compare thee to a summer's day? is ien fan de bekendste fan de 154 Sonnetten fan William Shakespeare. It tema is de fergonklikens fan ierdske moaiens en de ivichheid fan de poëzy. Hjoeddedei wurdt jamk te praat brocht dat it oarspronklike ûnderwerp fan it gedicht, Shakespeares leafste, foar wa't it gedicht skreaun is, in man wie, wylst mannichien it sonnet brûkt ta it beskriuwen fan in frou.
Shall I compare thee to a summer's day?
Thou art more lovely and more temperate.
Rough winds do shake the darling buds of May,
And summer's lease hath all too short a date.
Sometime too hot the eye of heaven shines,
And often is his gold complexion dimmed,
And every fair from fair sometime declines,
By chance or nature's changing course untrimmed;
But thy eternal summer shall not fade
Nor lose possession of that fair thou ow'st,
Nor shall death brag thou wander'st in his shade
When in eternal lines to time thou grow'st.