The 1971 Embassy British Indoor Championships was a combined men's and women's Grand Prix tennis tournament played on indoor carpet courts.

The event was categorized as a B Class tournament and was the 4th edition of the British Indoor Championships in the Open era.

[2] The men's singles event was won by unseeded Ilie Năstase who received 30 Grand Prix ranking points for his tournament victory.

Billie Jean King won the women's singles title.

[3] Ilie Năstase defeated Rod Laver 3–6, 6–3, 3–6, 6–4, 6–4 Billie Jean King defeated Françoise Dürr 6–1, 5–7, 7–5 Bob Hewitt / Frew McMillan defeated Bill Bowrey / Owen Davidson 7–5, 9–7, 6–2 Françoise Dürr / Virginia Wade defeated Evonne Goolagong / Julie Heldman 3–6, 7–5, 6–3