The Basmala or Basmalah (Arabic: بَسْمَلَة, romanized: basmalah; also known as Tasmiya by its opening words Bi-'sm-illāh; بِسْمِ ٱللهِ, "In the name of God") is an Islamic phrase meaning “In the name of God, the Most Gracious, the Most Merciful” (Arabic: بِسْمِ ٱللهِ ٱلرَّحْمَٰنِ ٱلرَّحِيْمِ, bi-smi llāhi r-raḥmāni r-raḥīm‹The template Smallsup is being considered for deletion.› ⁱ). It is one of the most important phrases in Islam and is frequently recited by Muslims before performing daily activities and religious practices, including prayer, and at the start of verses (āyah) or chapters (surahs) of the Qur'an.

In the Quran, it is recited before each chapter (surah), except for the ninth chapter At-Tawbah. Scholarly debates regarding its inclusion in the Qur'anic text reached consensus with the 1924 Cairo Edition, where it was included as the first verse (āyah) of Al-Fatiha and remained an unnumbered line preceding each of the 112 other chapters.

Historically, the Islamic Basmala appears to be related to earlier variants of the phrase appearing in Arabian inscriptions dating back to the 5th and 6th centuries.

The Basmala is used in constitutions of over half of the countries where Islam is the state religion or more than half of the population follows Islam, usually the first phrase in the preamble, including those of Afghanistan, Bahrain, Bangladesh, Brunei, Egypt, Iran, Iraq, Kuwait, Libya, Maldives, Pakistan, Saudi Arabia, Tunisia, and the United Arab Emirates.

The traditional name for the phrase in Classical Arabic was Tasmiyah. Other common phrases in Islam were also given their own names based on verb form 2 verbal nouns, including Tasbih.
The word basmala was derived from a slightly unusual procedure, in which the first four pronounced consonants of the phrase bismi-llāhi... were used to create a new quadriliteral root: b-s-m-l (ب-س-م-ل). This quadriliteral root was used to derive the noun basmala and its related verb forms, meaning "to recite the basmala". The method of coining a quadriliteral name from the consonants of multiple words in a phrase is also used to create the name '"Hamdala" for Alhamdulillah (In praise of the god), instead of the traditional name of Tahmid. The same procedure is also used to create the term Hawqala.

According to Lane, ar-raḥmān has the more intensive meaning, taken to include as objects of "sympathy" both the believer and the unbeliever, and may therefore be rendered as "the Compassionate"; ar-raḥīm, on the other hand, is taken to include as objects the believer in particular, may be rendered as "the Merciful" (considered as expressive of a constant attribute).

In the Qur'an, the Basmala, is usually numbered as the first verse of the first sura, but, according to the view adopted by Al-Tabari, it precedes the first verse. Apart from the ninth sura ("At-Tawba"), Al-Qurtubi reported that the correct view is that the Basmala ignored at the beginning of At-Tawba because Gabriel did not refer to the Basmala in this surah. Another view says that the Islamic prophet Muhammad died before giving a clarification if At-Tawba is part of Quran 8 (al-ʾanfāl) or not. It occurs at the beginning of each subsequent sura of the Qur'an and is usually not numbered as a verse except at its first appearance at the start of the first sura. The Basmala occurs as part of a sura's text in verse 30 of the 27th sura ("An-Naml"), where it prefaces a letter from Sulayman to Bilqis, the Queen of Sheba.

The Basmala is used extensively in everyday Muslim life, said as the opening of each action in order to receive blessing from God. Reciting the Basmala is a necessary requirement in the preparation of halal food.