In this chapter, we intend to discuss the sum to ‘n’ terms of some other special series viz. series of natural numbers, series of the square of natural numbers, series of cubes of natural numbers, etc. Special Series is the series which are special in some way. It could be arithmetic or geometric. Some of the special series are: (i) 1 + 2 + 3 +… + n (sum of first n natural numbers) (ii) 12 + 22 + 32 +… + n2 (sum of squares of the first n natural numbers). In this chapter, students learn about some special series, other than Arithmetic Progression and Geometric Progression, in detail. We intend to discuss the sum to ‘n’ terms of some other special series viz. series of natural numbers, series of the square of natural numbers, series of cubes of natural numbers, etc.