Yes, it is safe to add orange peel to your compost. While non-organic oranges may be treated with pesticides, the same is true of most non-organic produce. These pesticides will typically evaporate quickly as the orange peel decomposes.

One thing to note however, is that orange peel (and the peel of other citrus fruits) can take a long time to decompose. To speed up decomposition it is recommended that you dry orange peel before adding it to your compost pile. You can either dry it in the oven, or by placing it in the sun. Cutting up the dried peel will speed up decomposition even further.
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