No, it is not haram (forbidden) to say "Alhamdulillah" after sneezing. In fact, it is encouraged.
The Sunnah of Saying Alhamdulillah After Sneezing
Islamic teachings promote expressing gratitude to Allah (God) for all blessings, including seemingly minor occurrences like sneezing. Saying "Alhamdulillah" (All praise is due to Allah), after sneezing is considered a Sunnah (a recommended practice of the Prophet Muhammad). This is supported by numerous narrations and scholarly consensus.
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The Prophet's Teachings: The Prophet Muhammad (peace and blessings be upon him) himself practiced and encouraged saying "Alhamdulillah" after sneezing. [Source: Various Hadith collections, supported by numerous online sources and Islamic scholarly works.]
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Etiquette of Sneezing: Islam emphasizes good manners and etiquette, and responding to a sneeze with "Alhamdulillah" is part of this etiquette. [Source: "Thus, Islam taught its ummah to be mindful of the etiquette and manners of sneezing as has been taught by the Prophet PBUH. Hence, in short, if a person sneezes, it is advised to do the following: The person who sneezes should recite tahmid which is by reciting Alhamdulillah or Alhamdulillahi ala kulli hal." - Pejabat Mufti Wilayah Persekutuan]
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Responding to "Alhamdulillah": When someone says "Alhamdulillah" after sneezing, it is customary for others to respond with "Yarhamukallah" (May Allah have mercy upon you). [Source: AL-KAFI #1683: SNEEZING, Pejabat Mufti Wilayah Persekutuan; Abu Moosa al-Ash'ari reported that the Prophet (peace and blessings of Allah be upon him) said: “When one of you sneezes and praises Allah, then say 'Yarhamuk ...” - islamqa.info]
Practical Application:
The act of saying "Alhamdulillah" after sneezing serves as a simple yet powerful reminder of Allah's grace and mercy. It encourages a habit of gratitude throughout the day.
