concertos composed by Benjamin Britten?

These are Britten's concertante works:

Piano Concerto Op 13 (original and revised versions)(1938 and 1945)

Violin Concerto Op 15 (1939, revised 1958)

Young Apollo, for Piano Quintet and Orchestra Op 16 (1939)

Diversions for Piano (left hand) and Orchestra Op 21 (1940, revised 1954)

Scottish Ballad for 2 Pianos and Orchestra Op 26 (1941)

Cello Symphony Op 68 (1963)

I have omitted the incomplete Concertante for Violin, Viola and Orchestra (1932) and Clarinet Concerto (1943) as completed by Colin Matthews.

The previous answerer neglected to inform you that most of the works he listed are not formally referred to as concertos.

Concertos are specific in form and format.

The concertos for Pianoforte and for Violin are the only truly concerto form works he wrote, although the 1963 Violoncello Symphony comes close but no cigar.